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Chemical composition of the body

Organization of the body.

  • Basic form and development
  • Effects of aging
  • Change incident to environmental factors

human body; human anatomy

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  • Biology LibreTexts - Introduction to the Human Body
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  • human body - Children's Encyclopedia (Ages 8-11)
  • human body - Student Encyclopedia (Ages 11 and up)
  • Table Of Contents

human body; human anatomy

What is the chemical composition of the human body?

Chemically, the human body consists mainly of water and organic compounds—i.e., lipids, proteins, carbohydrates, and nucleic acids. The human body is about 60 percent water by weight.

What are the four main types of tissue in the human body?

The four main types of tissue in the human body are epithelial , muscle , nerve , and connective .

What are the nine major organ systems in the human body?

The nine major organ systems in the human body are the integumentary system, the musculoskeletal system, the respiratory system, the circulatory system, the digestive system, the excretory system, the nervous system, the endocrine system, and the reproductive system.

human body , the physical substance of the human organism, composed of living cells and extracellular materials and organized into tissues , organs , and systems.

Human anatomy and physiology are treated in many different articles. For detailed discussions of specific tissues, organs, and systems, see human blood ; cardiovascular system ; human digestive system ; human endocrine system ; renal system ; skin ; human muscle system ; nervous system ; human reproductive system ; human respiration ; human sensory reception ; and human skeletal system . For a description of how the body develops, from conception through old age , see aging ; growth ; prenatal development ; and human development .

For detailed coverage of the body’s biochemical constituents , see protein ; carbohydrate ; lipid ; nucleic acid ; vitamin ; and hormone . For information on the structure and function of the cells that constitute the body, see cell .

Many entries describe the body’s major structures. For example, see abdominal cavity ; adrenal gland ; aorta ; bone ; brain ; ear ; eye ; heart ; kidney ; large intestine ; lung ; nose ; ovary ; pancreas ; pituitary gland ; small intestine ; spinal cord ; spleen ; stomach ; testis ; thymus ; thyroid gland ; tooth ; uterus ; and vertebral column .

Male muscle, man flexing arm, bicep curl.

Humans are, of course, animals —more particularly, members of the order Primates in the subphylum Vertebrata of the phylum Chordata. Like all chordates , the human animal has a bilaterally symmetrical body that is characterized at some point during its development by a dorsal supporting rod (the notochord ), gill slits in the region of the pharynx , and a hollow dorsal nerve cord. Of these features, the first two are present only during the embryonic stage in the human; the notochord is replaced by the vertebral column, and the pharyngeal gill slits are lost completely. The dorsal nerve cord is the spinal cord in humans; it remains throughout life.

describe human body essay

Characteristic of the vertebrate form, the human body has an internal skeleton that includes a backbone of vertebrae. Typical of mammalian structure, the human body shows such characteristics as hair , mammary glands , and highly developed sense organs.

Beyond these similarities, however, lie some profound differences. Among the mammals , only humans have a predominantly two-legged ( bipedal ) posture, a fact that has greatly modified the general mammalian body plan. (Even the kangaroo , which hops on two legs when moving rapidly, walks on four legs and uses its tail as a “third leg” when standing.) Moreover, the human brain, particularly the neocortex, is far and away the most highly developed in the animal kingdom. As intelligent as are many other mammals—such as chimpanzees and dolphins —none have achieved the intellectual status of the human species.

Chemically, the human body consists mainly of water and of organic compounds —i.e., lipids, proteins, carbohydrates, and nucleic acids. Water is found in the extracellular fluids of the body (the blood plasma , the lymph , and the interstitial fluid) and within the cells themselves. It serves as a solvent without which the chemistry of life could not take place. The human body is about 60 percent water by weight.

Lipids —chiefly fats , phospholipids , and steroids —are major structural components of the human body. Fats provide an energy reserve for the body, and fat pads also serve as insulation and shock absorbers. Phospholipids and the steroid compound cholesterol are major components of the membrane that surrounds each cell.

Proteins also serve as a major structural component of the body. Like lipids, proteins are an important constituent of the cell membrane . In addition, such extracellular materials as hair and nails are composed of protein. So also is collagen , the fibrous, elastic material that makes up much of the body’s skin, bones, tendons, and ligaments. Proteins also perform numerous functional roles in the body. Particularly important are cellular proteins called enzymes , which catalyze the chemical reactions necessary for life.

Carbohydrates are present in the human body largely as fuels, either as simple sugars circulating through the bloodstream or as glycogen , a storage compound found in the liver and the muscles. Small amounts of carbohydrates also occur in cell membranes, but, in contrast to plants and many invertebrate animals, humans have little structural carbohydrate in their bodies.

Nucleic acids make up the genetic materials of the body. Deoxyribonucleic acid ( DNA ) carries the body’s hereditary master code, the instructions according to which each cell operates. It is DNA, passed from parents to offspring, that dictates the inherited characteristics of each individual human. Ribonucleic acid ( RNA ), of which there are several types, helps carry out the instructions encoded in the DNA.

Along with water and organic compounds , the body’s constituents include various inorganic minerals. Chief among these are calcium , phosphorus , sodium , magnesium , and iron . Calcium and phosphorus, combined as calcium-phosphate crystals, form a large part of the body’s bones. Calcium is also present as ions in the blood and interstitial fluid , as is sodium. Ions of phosphorus, potassium, and magnesium, on the other hand , are abundant within the intercellular fluid. All of these ions play vital roles in the body’s metabolic processes. Iron is present mainly as part of hemoglobin , the oxygen-carrying pigment of the red blood cells . Other mineral constituents of the body, found in minute but necessary concentrations, include cobalt , copper , iodine , manganese , and zinc .

describe human body essay

The cell is the basic living unit of the human body—indeed, of all organisms. The human body consists of trillions of cells, each capable of growth, metabolism , response to stimuli , and, with some exceptions, reproduction. Although there are some 200 different types of cells in the body, these can be grouped into four basic classes. These four basic cell types, together with their extracellular materials, form the fundamental tissues of the human body:

  • epithelial tissues, which cover the body’s surface and line the internal organs, body cavities, and passageways
  • muscle tissues, which are capable of contraction and form the body’s musculature
  • nerve tissues, which conduct electrical impulses and make up the nervous system
  • connective tissues , which are composed of widely spaced cells and large amounts of intercellular matrix and which bind together various body structures

Bone and blood are considered specialized connective tissues, in which the intercellular matrix is, respectively, hard and liquid.

How can a failure in the endocrine system affect the digestive, circulatory, and excretory systems?

The next level of organization in the body is that of the organ . An organ is a group of tissues that constitutes a distinct structural and functional unit. Thus, the heart is an organ composed of all four tissues, whose function is to pump blood throughout the body. Of course, the heart does not function in isolation; it is part of a system composed of blood and blood vessels as well. The highest level of body organization, then, is that of the organ system.

The body includes nine major organ systems, each composed of various organs and tissues that work together as a functional unit. The chief constituents and prime functions of each system are:

  • The integumentary system , composed of the skin and associated structures, protects the body from invasion by harmful microorganisms and chemicals; it also prevents water loss from the body.
  • The musculoskeletal system (also referred to separately as the muscle system and the skeletal system ), composed of the skeletal muscles and bones (with about 206 of the latter in adults), moves the body and protectively houses its internal organs.
  • The respiratory system , composed of the breathing passages, lungs, and muscles of respiration , obtains from the air the oxygen necessary for cellular metabolism; it also returns to the air the carbon dioxide that forms as a waste product of such metabolism.
  • The circulatory system , composed of the heart, blood, and blood vessels, circulates a transport fluid throughout the body, providing the cells with a steady supply of oxygen and nutrients and carrying away waste products such as carbon dioxide and toxic nitrogen compounds.
  • The digestive system , composed of the mouth, esophagus , stomach, and intestines, breaks down food into usable substances (nutrients), which are then absorbed from the blood or lymph; this system also eliminates the unusable or excess portion of the food as fecal matter.
  • The excretory system , composed of the kidneys, ureters, urinary bladder , and urethra , removes toxic nitrogen compounds and other wastes from the blood.
  • The nervous system , composed of the sensory organs, brain, spinal cord, and nerves, transmits, integrates , and analyzes sensory information and carries impulses to effect the appropriate muscular or glandular responses.
  • The endocrine system , composed of the hormone -secreting glands and tissues, provides a chemical communications network for coordinating various body processes.
  • The reproductive system , composed of the male or female sex organs, enables reproduction and thereby ensures the continuation of the species.

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Essay on Human Body

Students are often asked to write an essay on Human Body in their schools and colleges. And if you’re also looking for the same, we have created 100-word, 250-word, and 500-word essays on the topic.

Let’s take a look…

100 Words Essay on Human Body

The marvel of the human body.

The human body is a complex, wonderful machine. It consists of many parts, all working together.

Body Systems

There are many systems in our body, like the skeletal system that provides structure, and the muscular system that allows movement.

Organs and Cells

Organs like the heart and lungs perform vital functions. Our body is also made up of trillions of tiny cells.

Body’s Defenses

The immune system protects us from disease, while the skin serves as a barrier against the outside world.

250 Words Essay on Human Body

Introduction.

The human body, a complex biological system, is a marvel of evolution. It comprises numerous organs, tissues, and cells, all working in harmony to maintain life. This essay delves into the intricacies of the human body, highlighting its major components and their functions.

Structural Organization

At the most basic level, cells form the building blocks of the human body. These cells group together to form tissues, which further combine to create organs. Each organ has a specific function, contributing to the body’s overall health and survival.

Systems of the Human Body

The body is divided into several systems, including the nervous, circulatory, respiratory, digestive, endocrine, and musculoskeletal systems. Each of these systems plays a crucial role. For instance, the nervous system, which includes the brain and spinal cord, controls body functions and enables cognition and consciousness.

Maintenance and Regulation

The human body’s homeostasis is fundamental to its functioning. This involves maintaining a constant internal environment, such as body temperature and pH balance. The endocrine system, with its hormones, and the nervous system play significant roles in this regulation.

In conclusion, the human body is an intricate and efficient system, a testament to the wonders of nature and evolution. Its complexity and functionality are a constant subject of study, offering endless possibilities for research and advancement in the field of medicine and biology.

500 Words Essay on Human Body

Structural complexity.

The human body is composed of several levels of structural organization. At the most basic level, we find cells – the building blocks of life. These cells group together to form tissues, which in turn combine to form organs. The organs then work together in organ systems to perform specific functions. The human body comprises eleven organ systems, each with its own unique role, yet they all work in unison to maintain homeostasis.

Functional Dynamics

The functionality of the human body is a testament to the intricate design and coordination of its systems. The circulatory system, for instance, is responsible for the transportation of nutrients, oxygen, and waste products around the body. The nervous system, on the other hand, acts as the body’s control center, sending and receiving signals to and from different parts of the body. The respiratory system facilitates the exchange of gases, while the digestive system breaks down food into nutrients that the body can use. These systems, among others, work in a coordinated fashion to ensure the smooth functioning of the body.

The Symbiotic Relationship

Adaptability and resilience.

One of the most remarkable characteristics of the human body is its adaptability and resilience. It can adapt to various environmental conditions, from the freezing temperatures of the Arctic to the scorching heat of the desert. The immune system, a complex network of cells, tissues, and organs, defends the body against harmful microorganisms, demonstrating the body’s resilience. Furthermore, the body has remarkable healing capabilities, with systems in place to repair damage and restore function.

In conclusion, the human body is an intricately designed system that showcases the marvels of evolution. Its structural complexity, functional dynamics, symbiotic relationship between systems, and adaptability and resilience are awe-inspiring. Understanding the human body not only allows us to appreciate the marvel that it is but also equips us with the knowledge to take better care of it. Indeed, the human body is a testament to the sophistication and beauty of biological engineering.

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  • How to write the body of an essay | Drafting & redrafting

How to Write the Body of an Essay | Drafting & Redrafting

Published on November 5, 2014 by Shane Bryson . Revised on July 23, 2023 by Shona McCombes.

The body is the longest part of an essay . This is where you lead the reader through your ideas, elaborating arguments and evidence for your thesis . The body is always divided into paragraphs .

You can work through the body in three main stages:

  • Create an  outline of what you want to say and in what order.
  • Write a first draft to get your main ideas down on paper.
  • Write a second draft to clarify your arguments and make sure everything fits together.

This article gives you some practical tips for how to approach each stage.

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Table of contents

Start with an outline, write the first draft, write the second draft, other interesting articles.

Before you start, make a rough outline that sketches out the main points you want to make and the order you’ll make them in. This can help you remember how each part of the essay should relate to the other parts.

However, remember that  the outline isn’t set in stone – don’t be afraid to change the organization if necessary. Work on an essay’s structure begins before you start writing, but it continues as you write, and goes on even after you’ve finished writing the first draft.

While you’re writing a certain section, if you come up with an idea for something elsewhere in the essay, take a few moments to add to your outline or make notes on your organizational plans.

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Your goals in the first draft are to turn your rough ideas into workable arguments, add detail to those arguments, and get a sense of what the final product will actually look like.

Write strong body paragraphs

Start wherever you want

Many writers do not begin writing at the introduction , or even the early body paragraphs. Start writing your essay where it seems most natural for you to do so.

Some writers might prefer to start with the easiest section to write, while others prefer to get the most difficult section out of the way first. Think about what material you need to clarify for yourself, and consider beginning there.

Tackle one idea at a time

Each paragraph should aim to focus on one central idea, giving evidence, explanation, and arguments that relate to that idea.

At the start of each paragraph, write a topic sentence that expresses the main point. Then elaborate and expand on the topic sentence in the rest of the paragraph.

When you’ve said everything you have to say about the idea, move onto a new paragraph.

Keep your argument flexible

You may realize as you write that some of your ideas don’t work as well as you thought they would. Don’t give up on them too easily, but be prepared to change or abandon sections if you realize they don’t make sense.

You’ll probably also come up with new ideas that you’d not yet thought of when writing the outline. Note these ideas down and incorporate them into the essay if there’s a logical place for them.

If you’re stuck on one section, move on to another part of the essay and come back to it later.

Don’t delete content

If you begin to dislike a certain section or even the whole essay, don’t scrap it in fit of rage!

If something really isn’t working, you can paste it into a separate document, but keep what you have, even if you don’t plan on using it. You may find that it contains or inspires new ideas that you can use later.

Note your sources

Students often make work for themselves by forgetting to keep track of sources when writing drafts.

You can save yourself a lot of time later and ensure you avoid plagiarism by noting down the name, year, and page number every time you quote or paraphrase from a source.

You can also use a citation generator to save a list of your sources and copy-and-paste citations when you need them.

Avoid perfectionism

When you’re writing a first draft, it’s important not to get slowed down by small details. Get your ideas down on paper now and perfect them later. If you’re unsatisfied with a word, sentence, or argument, flag it in the draft and revisit it later.

When you finish the first draft, you will know which sections and paragraphs work and which might need to be changed. It doesn’t make sense to spend time polishing something you might later cut out or revise.

Working on the second draft means assessing what you’ve got and rewriting it when necessary. You’ll likely end up cutting some parts of the essay and adding new ones.

Check your ideas against your thesis

Everything you write should be driven by your thesis . Looking at each piece of information or argumentation, ask yourself:

  • Does the reader need to know this in order to understand or accept my thesis?
  • Does this give evidence for my thesis?
  • Does this explain the reasoning behind my thesis?
  • Does this show something about the consequences or importance of my thesis?

If you can’t answer yes to any of these questions, reconsider whether it’s relevant enough to include.

If your essay has gone in a different direction than you originally planned, you might have to rework your thesis statement to more accurately reflect the argument you’ve made.

Watch out for weak points

Be critical of your arguments, and identify any potential weak points:

  • Unjustified assumptions: Can you be confident that your reader shares or will accept your assumptions, or do they need to be spelled out?
  • Lack of evidence:  Do you make claims without backing them up?
  • Logical inconsistencies:  Do any of your points contradict each other?
  • Uncertainty: Are there points where you’re unsure about your own claims or where you don’t sound confident in what you’re saying?

Fixing these issues might require some more research to clarify your position and give convincing evidence for it.

Check the organization

When you’re happy with all the main parts of your essay, take another look at the overall shape of it. You want to make sure that everything proceeds in a logical order without unnecessary repetition.

Try listing only the topic sentence of each paragraph and reading them in order. Are any of the topic sentences too similar? Each paragraph should discuss something different; if two paragraphs are about the same topic, they must approach it in different ways, and these differences should be made clear in the topic sentences.

Does the order of information make sense? Looking at only topic sentences lets you see at a glance the route your paper takes from start to finish, allowing you to spot organizational errors more easily.

Draw clear connections between your ideas

Finally, you should assess how your ideas fit together both within and between paragraphs. The connections might be clear to you, but you need to make sure they’ll also be clear to your reader.

Within each paragraph, does each sentence follow logically from the one before it? If not, you might need to add new sentences to make the connections clear. Try using transition words to clarify what you want to say.

Between one paragraph and the next, is it clear how your points relate to one another? If you are moving onto an entirely new topic, consider starting the paragraph with a transition sentence that moves from the previous topic and shows how it relates to the new one.

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Shane finished his master's degree in English literature in 2013 and has been working as a writing tutor and editor since 2009. He began proofreading and editing essays with Scribbr in early summer, 2014.

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Human Body Essay

Introduction.

It is surprising to see how a human body functions with maximum capability. Whether we are talking, walking or seeing, there are distinct parts in our body that are destined to perform a particular function. The importance of each part is discussed in this human body essay. When we feel tired, we often take a rest and lie down for a moment. But our body continues to work, even when we take a break. Even if you are tired, your heart will not stop beating. It pumps blood and transports nutrients to your body.

The human body is made up of many parts and organs that work together to sustain life in our body. No organ or body part is more important than the other, and if you ignore one of them, then the whole body will be in pain. So, let us teach the significance of different parts of the body to our children through this essay on human body parts in English. To explore other exciting content for kids learning , head to our website.

describe human body essay

Different Systems in the Human Body

The human body looks very simple from the outside with hands, legs, face, eyes, ears and so on. But, there is a more complex and significant structure inside the body that helps us to live. The human body is made up of many small structures like cells, tissues, organs and systems. It is covered by the skin, beneath which you could find muscles, veins, and blood. This structure is formed on the base of a skeleton, which consists of many bones. All these are arranged in a specific way to help the body function effectively. In this human body essay, we will see the different systems in the human body and their functions.

The circulatory system, respiratory system, digestive system and nervous system are the main systems of the human body. Each system has different organs, and they function together to accomplish several tasks. The circulatory system consists of organs like the heart, blood and blood vessels, and its main function is to pump blood from the heart to the lungs and carry oxygen to different parts of the body.

Next, we will understand the importance of the respiratory system through this human body essay in English. The respiratory system enables us to breathe easily, and it includes organs like the lungs, airways, windpipe, nose and mouth. While the digestive system helps in breaking down the food we eat and gives the energy to work with the help of organs like the mouth, food pipe, stomach, intestines, pancreas, liver, and anus, the nervous system controls our actions, thoughts and movements. It mainly consists of organs like the brain, spinal cord and nerves.

All these systems are necessary for the proper functioning of the human body, which is discussed in this essay on human body parts in English. By inculcating good eating habits, maintaining proper hygiene and doing regular exercises, we can look after our bodies. You can refer to more essays for kids on our website.

Frequently Asked Questions on Human Body Essay

Why should we take care of our bodies.

Most of the tasks we do like walking, running, eating etc., are only possible if we have a healthy body. To ensure we have a healthy body, all the systems must function properly, which is determined by our lifestyle and eating habits. Only a healthy body will have a healthy mind, and hence, we must take good care of our bodies.

What are some of the body parts and their functions?

We see with our eyes, listen with our ears, walk with our legs, touch with our hands, breathe through our nose and taste with our tongue.

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Human Body Essay | Essay on Human Body in Life for Students and Children in English

February 12, 2024 by sastry

Human Body Essay: Human body is truly a marvel. It is perhaps the most evolved living thing. It is, in fact, like a highly sophisticated machine.

You can read more  Essay Writing  about articles, events, people, sports, technology many more.

Short Essay on Human Body 200 Words for Kids and Students in English

Below we have given a short essay on Human Body is for Classes 1, 2, 3, 4, 5 and 6. This short essay on the topic is suitable for students of class 6 and below.

To prevent it from diseases and illnesses, a thorough knowledge of the human body is necessary. Medical science has unravelled many mysteries of the functions of our body. And, the more we find out, the more fascinating the human body appears to be. But there is still a lot that we don’t know or can’t explain.

The human skeleton is like a cage. It provides the necessary support to the body. It also helps in protecting our vital organs. There are 206 bones in an adult human body. These bones are made up of calcium and phosphorus. The box-like skull structure protects our brain.

The muscles constitute the flesh. There are over 600 muscles in our body. All our movements are the direct result of the contraction and expansion of these muscles.

Human Body Essay

A cell is the basic unit of the body and there are millions of cells in each human body. These cells get nourishment through food, drink and oxygen. The cell suffer wear and tear during work. But through adequate rest and food the damage to the cell is repaired.

Then, there are the circulatory, respiratory, disgestive and nervous systems in our body. They are all highly complex systems but each is wonderful in its own way. Human heart and brain must be two of the most wonderful creations ever. They are extremely complicated but also very efficient parts of our body.

For us to live and remain healthy, it is important for all these parts and systems to work well together, in harmony with each other.

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1.2 Structural Organization of the Human Body

Learning objectives.

By the end of this section, you will be able to:

  • Describe the structure of the body, from simplest to most complex
  • Describe the interrelationships between the organ systems

Before you begin to study the different structures and functions of the human body, it is helpful to consider its basic architecture; that is, how its smallest parts are assembled into larger structures. It is convenient to consider the structures of the body in terms of fundamental levels of organization that increase in complexity, such as (from smallest to largest): chemicals, cells, tissues, organs, organ systems, and an organism.

This illustration shows biological organization as a pyramid. The chemical level is at the apex of the pyramid where atoms bond to form molecules with three dimensional structures. An example is shown with two white hydrogen atoms bonding to a red oxygen atom to create water. The next level down on the pyramid is the cellular level, as illustrated with a long, tapered, smooth muscle cell. At this level, a variety of molecules combine to form the interior fluid and organelles of a body cell. The next level down is the tissue level. A community of similar cells forms body tissue. The example given here is a section of smooth muscle tissue, which contains many smooth muscle cells closely bound side by side. The next level down is the organ level, as illustrated with the bladder and urethra. The bladder contains smooth muscle while the urethra contains skeletal muscle. These are both examples of muscle tissues. The next level down is the organ system level, as illustrated by the entire urinary system containing the kidney, ureters, bladder and urethra. At this level, two or more organs work closely together to perform the functions of a body system. At the base of the pyramid is the organismal level illustrated with a woman drinking water. At this level, many organ systems work harmoniously together to perform the functions of an independent organism.

The organization of the body often is discussed in terms of the distinct levels of increasing complexity, from the smallest chemical building blocks to a unique human organism.

The Levels of Organization

To study the chemical level of organization, scientists consider the simplest building blocks of matter: subatomic particles, atoms and molecules. All matter in the universe is composed of one or more unique pure substances called elements. Examples of these elements are hydrogen, oxygen, carbon, nitrogen, calcium, and iron. The smallest unit of any of these pure substances (elements) is an atom. Atoms are made up of subatomic particles such as the proton, electron and neutron. Two or more atoms combine to form a molecule, such as the water molecules, proteins, and sugars found in living things. Molecules are the chemical building blocks of all body structures.

A cell is the smallest independently functioning unit of a living organism. Single celled organisms, like bacteria, are extremely small, independently-living organisms with a cellular structure. Humans are multicellular organisms with independent cells working in concert together. Each bacterium is a single cell. All living structures of human anatomy contain cells, and almost all functions of human physiology are performed in cells or are initiated by cells.

A human cell typically consists of flexible membranes that enclose cytoplasm, a water-based cellular fluid, with a variety of tiny functioning units called organelles . In humans, as in all organisms, cells perform all functions of life.

A tissue is a group of many similar cells (though sometimes composed of a few related types) that work together to perform a specific function. An organ is an anatomically distinct structure of the body composed of two or more tissue types. Each organ performs one or more specific physiological functions. An organ system is a group of organs that work together to perform major functions or meet physiological needs of the body.

This book covers eleven distinct organ systems in the human body ( Figure 1.2.2 ). Assigning organs to organ systems can be imprecise since organs that “belong” to one system can also have functions integral to another system. In fact, most organs contribute to more than one system.

This illustration shows eight silhouettes of a human female, each showing the components of a different organ system. The integumentary system encloses internal body structures and is the site of many sensory receptors. The integumentary system includes the hair, skin, and nails. The skeletal system supports the body and, along with the muscular system, enables movement. The skeletal system includes cartilage, such as that at the tip of the nose, as well as the bones and joints. The muscular system enables movement, along with the skeletal system, but also helps to maintain body temperature. The muscular system includes skeletal muscles, as well as tendons that connect skeletal muscles to bones. The nervous system detects and processes sensory information and activates bodily responses. The nervous system includes the brain, spinal cord, and peripheral nerves, such as those located in the limbs. The endocrine system secretes hormones and regulates bodily processes. The endocrine system includes the pituitary gland in the brain, the thyroid gland in the throat, the pancreas in the abdomen, the adrenal glands on top of the kidneys, and the testes in the scrotum of males as well as the ovaries in the pelvic region of females. The cardiovascular system delivers oxygen and nutrients to the tissues as well as equalizes temperature in the body. The cardiovascular system includes the heart and blood vessels.

The organism level is the highest level of organization. An organism is a living being that has a cellular structure and that can independently perform all physiologic functions necessary for life. In multi-cellular organisms, including humans, all cells, tissues, organs, and organ systems of the body work together to maintain the life and health of the organism.

Chapter Review

Life processes of the human body are maintained at several levels of structural organization. These include the chemical, cellular, tissue, organ, organ system, and the organism level. Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form organisms.

Review Questions

Critical thinking questions.

Cancers are defined by uncontrolled growth at the cellular level. Describe why cancer is a problem for the organism as a whole using your understanding of the levels of organization.

Cellular problems create issues at more complex levels of organization. For example, a tumor can interrupt the function of the organ it is in, despite the fact that it is a molecular mutation with direct cellular implications.

The female ovaries and the male testes are a part of which body system? Can these organs be members of more than one organ system? Why or why not?

The female ovaries and the male testes are parts of the reproductive system. They also secrete hormones, as does the endocrine system, therefore, ovaries and testes function within both the endocrine and reproductive systems.

This work, Anatomy & Physiology, is adapted from Anatomy & Physiology by OpenStax , licensed under CC BY . This edition, with revised content and artwork, is licensed under CC BY-SA except where otherwise noted.

Images, from Anatomy & Physiology by OpenStax , are licensed under CC BY except where otherwise noted.

Access the original for free at https://openstax.org/books/anatomy-and-physiology/pages/1-introduction .

Anatomy & Physiology Copyright © 2019 by Lindsay M. Biga, Staci Bronson, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Matern, Katie Morrison-Graham, Kristen Oja, Devon Quick, Jon Runyeon, OSU OERU, and OpenStax is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License , except where otherwise noted.

describe human body essay

Introduction to the Human Body

The human body is a complex, highly organized structure made up of unique cells that work together to accomplish the specific functions necessary for sustaining life.

describe human body essay

The biology of the human body includes

Physiology (how the body functions)

Anatomy (how the body is structured)

Anatomy is organized by levels, from the smallest components of cells to tissues and organs and to organ systems .

Gross anatomy is the study of the body's organs as seen with the naked eye during visual inspection and when the body is cut open for examination (dissection).

Cellular anatomy is the study of cells and their components, which can be observed only with the use of special techniques and special instruments such as microscopes.

Molecular anatomy (often called molecular biology) is the study of the smallest components of cells at the biochemical level.

Anatomy and physiology change remarkably between fertilization and birth. After birth, the rate of anatomic and physiologic changes slows, but childhood is still a time of remarkable growth and development ( see Physical Growth of Infants and Children ). Some anatomic changes occur past adulthood, but the physiologic changes in the body's cells and organs are what contribute most to what we experience as aging ( see Changes in the Body With Aging ).

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What are the systems of the body? Fast facts about the human body and how it works

Learn all about the human body's many systems and some of its individual organs, both vital and vestigial.

photo of a student holding a pen and notebook as she looks at a 3D model of the systems of the human body

The human body is a complex network of systems that work together to keep life-sustaining processes running smoothly. These systems break down food for fuel, clear away waste, repair damaged tissues and DNA, fight infectious germs and monitor the outside world so we can move through it safely. 

Many scientists spend their days working to understand how each bodily system performs its jobs, how the systems interact, and what can happen when one or more of them falter. Such malfunctions can stem from aging or disease, for instance, and through medical care, doctors aim to get derailed systems back on track. 

Here's a quick rundown of the systems of the human body, its vital organs and its "vestigial" organs, as well as a few fascinating facts about how the body works.

What are the different systems of the human body? 

Our bodies consist of a number of biological systems that carry out specific functions necessary for everyday living. Some organs and tissues play roles in multiple systems at once.

Related: Strange, two-faced brain cells confirmed to exist, and they may play a role in schizophrenia  

Circulatory : The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide and hormones around the body. It consists of the heart, blood, blood vessels, arteries and veins. According to the Cleveland Clinic , the adult human body's network of blood vessels is more than 60,000 miles (around 100,000 kilometers) long. 

Digestive: The digestive system consists of a series of connected organs that together allow the body to break down and absorb nutrients from food and remove waste. It includes the mouth, esophagus, stomach, small intestine , large intestine, rectum and anus. The large intestine is home to microorganisms that are collectively called the gut microbiome and influence our health in various ways . The liver and pancreas also have roles in the digestive system because they produce digestive juices filled with enzymes to break down the components of food, such as carbohydrates , fats and proteins , according to the National Institute of Diabetes and Digestive and Kidney Diseases .

Endocrine: The endocrine system consists of a network of glands that secrete hormones — long-range chemical messengers that regulate how cells and tissue function — into the blood. These hormones, in turn, travel to different tissues and regulate many bodily functions, such as metabolism , growth and sexual function, according to Johns Hopkins Medicine . For example, the pancreas releases the hormones insulin and glucagon to regulate blood sugar . Conditions like diabetes and insulin resistance arise from the body having too little insulin or not responding to it adequately. 

Related: Meet the 'exclusome': A mini-organ just discovered in cells that defends the genome from attack

simple diagram depicting 6 organ systems in the human body

Immune: The immune system is the body's defense against bacteria , viruses and other pathogens that may be harmful. Components of the system include the lymph nodes , which contain infection-fighting cells called lymphocytes. These lymphocytes are one of many types of leukocyte , or white blood cell. The immune system also includes the spleen , the bone marrow and a gland called the thymus . The immune system can learn to recognize antigens — proteins on the surface of bacteria, fungi and viruses — and alert the body to their presence. Some immune cells make proteins called antibodies that attach to these antigens and mark invaders for destruction. 

Lymphatic: The lymphatic system includes the lymph nodes, lymph ducts and lymph vessels and is considered part of the immune system. Its main job is to make and move lymph , a clear fluid that contains white blood cells. The lymphatic system also removes excess lymph fluid from the body's tissues and returns it to the blood.

Nervous: The nervous system controls both voluntary actions, such as conscious movements, and involuntary actions,like breathing, and it sends signals to and detects signals from different parts of the body. Conscious actions are controlled by the somatic nervous system, while involuntary actions are controlled by the autonomic nervous system. The autonomic nervous system dictates whether we're in " rest and digest " or " fight or flight " mode. The nervous system can further be split up into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system, or the nerves connecting the CNS to every other part of the body.

Muscular: The body's muscular system consists of hundreds of muscles that aid movement, blood flow and other bodily functions, according to the Library of Congress . There are three types of muscle: skeletal, which is connected to bone and helps with voluntary movement; smooth, which is found inside organs and helps to move substances through them; and cardiac, which is found in the heart. The body's largest muscle by mass is the gluteus maximus, but the two latissimus dorsi are the largest in terms of surface area.

Related: Why is it harder for some people to build muscle than others?

Reproductive: The reproductive system allows humans to produce offspring. The male reproductive system includes the penis and the testes , which produce sperm. The female reproductive system includes the vagina, uterus and ovaries, which produce eggs. During fertilization, a sperm cell will fuse with an egg cell that, in a successful pregnancy, will then implant in the uterus. The fertilized egg will then mature into what's called a blastocyst, then an embryo and, finally, a fetus. A placenta forms to support this process. 

photo of the skull of a classroom human skeleton model

Skeletal: Our bodies are supported by the skeletal system , which contains between 206 and 213 bones in an adult human body, due to slight variations in people's anatomy, according to the medical resource StatPearls . These bones are connected by tissues called tendons, ligaments and cartilage. As infants, humans have about 300 bones , but some fuse together as the child grows. The skeleton not only helps us move but is  also involved in the production of blood cells and the storage of calcium. The teeth are also part of the skeletal system, but they aren't considered bones . The smallest bones in the body are found in the ear, and the largest is the femur, or thigh bone, which is also one of the heaviest body parts .

Respiratory: The respiratory system allows us to take in oxygen and expel carbon dioxide through breathing. It includes the lungs ; trachea, or windpipe; and the diaphragm, a muscle that pulls air into and pushes air out of the lungs.

Urinary: The urinary system helps eliminate a waste product called urea, which is produced when certain foods are broken down. The system includes the two kidneys; two ureters, or tubes leaving the kidneys; the bladder; two sphincter muscles; and the urethra. The kidneys filter blood in the body to make urine that then travels down the ureters to the bladder and exits the body through the urethra.

Integumentary: The skin, hair and nails make up the integumentary system. Skin is the body's largest organ . It protects our innards from the outside world, serving as our first defense against bacteria, viruses and other pathogens, for instance. Our skin also helps regulate body temperature and eliminate waste through perspiration, or sweat. 

Related: Scientists discover new way humans feel touch  

What are the body's vital organs?

Click the purple circles to learn about the body's vital organs, including the brain, lungs, heart, liver and kidneys. They're considered vital because you need a functioning brain, heart, liver, at least one kidney and at least one lung to survive. That said, there are medical devices and treatments that can make up for a loss of function in these organs, at least temporarily — for example, ECMO machines can do the work of the heart and lungs, and dialysis can filter the blood of people with kidney failure.

  • The average adult male body contains about 36 trillion cells , the average adult female body contains 28 trillion cells and a 10-year-old has about 17 trillion. 
  • It's often said that there are 78 organs in the human body , but the number actually differs depending on whom you ask. 
  • There's a popular idea that the body replaces itself every seven years . But that's not really true, because tissues renew themselves at different rates. 
  • Oxygen is the most common element in the human body , followed by carbon. 
  • The average adult body contains about 1.2 to 1.5 gallons (4.5 to 5.5 liters) of blood . 
  • Humans' average body temperature has fallen slightly over time, so it's no longer 98.6 degrees Fahrenheit (37 degrees Celsius). 
  • The most detailed map of the human brain to date contains more than 3,300 types of brain cells . 

What are vestigial organs?

illustration of the appendix, depicted in pink, extending off of the colon, depicted in blue

There are arguably some parts of the human body that don't serve any useful purpose, such as the male nipple. That said, the usefulness of some organs is still up for debate , as scientists have often judged the worth of body parts before discovering their purposes. 

Broadly speaking, vestigial body parts are defined as those that have lost their original physiological significance to humans over the course of evolutionary history. The idea is that, while we inherited them from an ancient ancestor, we could really do without them in the modern day. 

— Scientists just discovered a new way cells control their genes — it's called 'backtracking'

— New part of the body found hiding in the lungs

— Scientists stumble upon a new part of a cell in one of the most studied animals on Earth  

Wisdom teeth are held up as one example of a vestigial body part, as the modern human jaw is often too small to accommodate a third set of molars. Some people also carry remnants of a vomeronasal organ that is largely thought to be nonfunctional in humans; animals use equivalent organs to detect each other's pheromones. 

Some scientists consider the human tailbone, or coccyx, vestigial because it's no longer a full-blown tail. But it's far from useless, as it still anchors many muscles, ligaments and tendons. And the appendix has gotten a bad rap for supposedly being both vestigial and useless, but more recently, scientists have uncovered possible functions for the long-maligned body part. 

Ever wonder why some people build muscle more easily than others or why freckles come out in the sun ? Send us your questions about how the human body works to [email protected] with the subject line "Health Desk Q," and you may see your question answered on the website!

Editor's note: This page was last updated on April 5, 2024.

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Rachael is a Live Science contributor, and was a former channel editor and senior writer for Live Science between 2010 and 2022. She has a master's degree in journalism from New York University's Science, Health and Environmental Reporting Program. She also holds a B.S. in molecular biology and an M.S. in biology from the University of California, San Diego. Her work has appeared in Scienceline, The Washington Post and Scientific American.

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describe human body essay

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The organization and structure of the human body.

The human body is made up of a complex structure of systems that all work together. There are several levels of organization to this structure, with each level more complex than the last.

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The Digestive System in the Human Body Essay

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Introduction

The stomach, large intestines, small intestines, works cited.

Human biology is a field in biology that deals with nutrition, anthropology, and medicine. The body of a human being contains a digestive system that deals with the digestion and absorption of food nutrients into the body. The stomach, small intestines, and large intestines are part of the digestive system. All of them are located at different positions in the body and have different functions and structures.

The stomach is an organ of digestion located between the esophagus and the duodenum on the left upper part of the abdominal cavity. It is a muscular, elastic pear-shaped bag lying just below the diaphragm. It is made up of five layers. The innermost layer is referred to as mucosa. The four sections of the stomach are the fundus, cardia, body, and pylorus. It is involved in the second phase of digestion after chewing. It secretes enzymes that help in the digestion of proteins. It also secretes some acids that help in the digestion of food. The major secretions are hydrochloric acid and protease enzymes. The work of hydrochloric acid is to kill any bacteria that may be in the food and provide an acidic pH that allows proteases to work effectively (Chiras 95).

The large intestines of the human body are located between the ileocecal junction and the rectum. They are about one and a half meters long and two and a half centimeters wide. The major parts of the large intestines are the caecum, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, and anal canal (Tortora and Grabowski 46). The large intestines receive food contents and fluids from the small intestines. The large intestines help in the re-absorption of water into the body system. The water absorbed is used to maintain the fluid balance of the body. Some vitamins that are created by the bacteria in the large intestines are also absorbed. They also help in the transport of waste products in form of stool out of the body.

The small intestines are located between the stomach and the large intestines. Specifically, they start at the pyloric sphincter and end at the ileocaecal valve. They are narrow and long to allow digestion and absorption of food. The standard length of the small intestines in an adult human being is five meters but they may be shorter or longer. The three parts of the small intestines are the duodenum, jejunum, and ileum (Tortora and Grabowski 49). The majority of digestion and absorption of food takes place in the small intestines. Chemical digestion takes place in the small intestines where many enzymes that facilitate digestion are secreted. In the small intestines, proteins and peptides are digested into amino acids. Lipase enzymes are used to degrade fats into glycerol and fatty acids. Some carbohydrates are also digested in the stomach to form simple sugars. The process of absorption takes place where food nutrients are diffused into the bloodstream. The small intestines have many villi that have networks of capillaries to help indigestion. Monosaccharides, amino acids, water, iron, and many others are absorbed here.

The digestive system in the human body mainly deals with digestion and absorption of food nutrients and fluids. The stomach is located between the esophagus and the duodenum and helps in the digestion of partially chewed food. The large intestines are located between the ileocecal junction and the rectum. They help in the absorption of water, some nutrients, and the excretion of wastes out of the body. The small intestines are located between the pyloric sphincter and the ileocaecal valve. They help in the digestion of food and absorption of food nutrients into the bloodstream.

Chiras, Daniel. Human Biology. Sixth Edition. London: Jones and Bartlett Punishers, 2009. Print.

Tortora, Gerald and Grabowski, Sandra. Introduction to the human body: the essentials of anatomy and physiology. Volume 1. New York: John Wiley & Sons, 2004. Print.

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Home — Essay Samples — Nursing & Health — Blood — Blood Circulation in the Human Body

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Blood Circulation in The Human Body

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describe human body essay

The Fascinating Science Behind the Body Farm

This essay is about the concept of “body farms” and their crucial role in forensic science and anthropology. It explains how these research facilities, first established by Dr. William Bass in 1981, help study human decomposition under various conditions to improve the accuracy of post-mortem interval (PMI) estimations. The research conducted at body farms enhances forensic methodologies and provides valuable insights into human taphonomy, benefiting both modern criminal investigations and the understanding of ancient human remains.

How it works

Concept of “farm of body”, presumably, foremost causes inconvenience, however these experience resources, what is specialized, obligatory for understanding of human processes of time-table. It is formally known how the judicial centers of research of anthropology, the farms of body are central in the help of judicial researches, identifying bits and pieces, and our advancing penetrating in changes on post mortem.

The introductory farm of body was set by Doctor William Bass in 1981 in University of Tennessee in Knoxville. But opening initiative appeared from a necessity to the detailed data on a human time-table, excelling previous studies, certain on feral models, what inadequate mirror human processes of disintegration.

These resources are foremost concentrated on research, how an ecological alike for variables temperature, humidity, and curriculum of man of action of activity of insect.

In the farms of body, sacrificed human bodies test different scenarios, to simulate the real terms. Some bodies pochowane, second left it is proposed on earth, some submerged in water, and second limited in mechanizations. Researchers of meticulously phase of curriculum of document, collecting central data, beginning critical for an estimation posthumous interval (Pmi) of -the time death. This research refined Pmi of method of determination substantially, substantial in judicial researches.

One of leading additions of farms of body is their role exactly, estimating Pmi. Calculating time, what flows since death is inalienable complicated from numberless influences. The farms of body provide a settlement that is managed, to insulate and to study these variables, bringing more exact Pmi over technique of estimation. Therefore, judicial definiteness of certificate in criminal cases is very propped up.

Additionally, farms of body considerably benefit anthropology, especially in the study of human taphonomy processes, what influences on an organism from death to become numb. Carefully the corresponding penetrating helps archaeologists understand better, how natural terms influence on maintenance of bits’ and pieces of man, thus interpretations of cleaning of old human places.

While the concept of farms of body, presumably, disturbs something, their deep holding to science and society is indisputable. Investigate moves in these resources not only helps in the decision of modern criminal cases but and deepens our understanding to human biology and time-table. Eventually, this work supports a justice and provides a halt for families of deceased.

Thus, farms of body are obligatory experience resources central to judicial science and anthropology. Studying a human time-table on condition of various, these centers do critical data that increase the estimation of Pmi, refine judicial methodologies, and translate critical studies for specialists. Without regard to their sullen nature, the farms of body extend our understanding of death and disintegration, with far-reaching values how for scientific knowledge, so and social benefit.

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Humans may soon live to be 1000 years old, says renowned scientist

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UNDATED (WKRC) - A renowned scientist claims humans may soon live to be around 1,000 years old.

According to BGR, futurist Raymon Kurzweil believes he has found a way to extend the life of a human for thousands of years. Per the outlet, citing Kurzweil's new book, nanorobots may be the key to slowing the aging process and extending human life.

Experts have raised concerns about extending the life of humans for thousands of years. It has not deterred acclaimed scientists from researching new anti-aging therapies, however, which continues to be a common focus of their research, per BGR.

Unlike many scientists who seek only to slow the deterioration of the body, Kurzweil wishes to use nanotechnology to "cure aging itself," according to the outlet.

In his new book, entitled The Singularity is Nearer , and in an essay published in Wired , Kurzweil explores the idea of blending biotechnology and artificial intelligence (AI) to help overcome the aging process.

According to BGR, as cells reproduce over the years, they accumulate errors, which result in aging. Anti-aging therapies aim to reduce the number of errors, which allows the body to repair itself more quickly.

Per BGR, Kurzweil understands that his projections may sound absurd in our current day, but said he believes advancements in medical nanorobots will soon cure aging across the board.

According to the outlet, a single human body might require several hundred-billion nanobots to repair and augment degrading organs to assure their function remains in peak condition.

describe human body essay

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  6. ⇉An Overview of the Human Body Essay Example

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  1. Human body

    Chemically, the human body consists mainly of water and of organic compounds —i.e., lipids, proteins, carbohydrates, and nucleic acids. Water is found in the extracellular fluids of the body (the blood plasma, the lymph, and the interstitial fluid) and within the cells themselves. It serves as a solvent without which the chemistry of life ...

  2. 100 Words Essay on Human Body

    The human body is a complex and fascinating entity that is the epitome of biological engineering. It is a marvel of evolution, honed over millions of years to become a highly efficient machine capable of extraordinary feats. This essay delves into the intricacies of the human body, exploring its structure, function, and the symbiotic ...

  3. Essay about Systems of the Human Body

    1336 Words. 6 Pages. Open Document. The human body is very complex. It is like a job. You have to do a million things in one day to make it through the day. The body uses nine systems to do all of those jobs. They all have separate functions, but some work together. Each system is also made up of organs.

  4. How to Write the Body of an Essay

    The body is always divided into paragraphs. You can work through the body in three main stages: Create an outline of what you want to say and in what order. Write a first draft to get your main ideas down on paper. Write a second draft to clarify your arguments and make sure everything fits together.

  5. Human Body Essay

    The human body is made up of many small structures like cells, tissues, organs and systems. It is covered by the skin, beneath which you could find muscles, veins, and blood. This structure is formed on the base of a skeleton, which consists of many bones. All these are arranged in a specific way to help the body function effectively.

  6. Tissues, organs, & organ systems (article)

    The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food. The survival of the organism depends on the integrated ...

  7. Human Body Essay

    Human Body Essay: Human body is truly a marvel. It is perhaps the most evolved living thing. It is, in fact, like a highly sophisticated machine. You can read more Essay Writing about articles, events, people, sports, technology many more. Short Essay on Human Body 200 Words for Kids and Students in English Below we have given a […]

  8. 1.2 Structural Organization of the Human Body

    Each organ performs one or more specific physiological functions. An organ system is a group of organs that work together to perform major functions or meet physiological needs of the body. This book covers eleven distinct organ systems in the human body (Figure 1.2.2). Assigning organs to organ systems can be imprecise since organs that ...

  9. Introduction to the Human Body

    The biology of the human body includes. Physiology (how the body functions) Anatomy (how the body is structured) Anatomy is organized by levels, from the smallest components of cells to tissues and organs and to organ systems. Gross anatomy is the study of the body's organs as seen with the naked eye during visual inspection and when the body ...

  10. The Anatomy of the Human Body

    The Institute of Human Anatomy's YouTube video, " The Anatomy of Pain ," visually explores the structures involved in pain's transmission and processing. The video was selected because it provides an excellent illustration of the physical basis for pain. The new knowledge acquired is that there are two facets to every person's ...

  11. 13.2: Organization of the Human Body

    After tissues, organs are the next level of organization of the human body. An organ is a structure that consists of two or more types of tissues that work together to do the same job. Examples of human organs include the brain, heart, lungs, skin, and kidneys. Human organs are organized into organ systems, many of which are shown in Figure ...

  12. What are the systems of the body? Fast facts about the human body and

    Some organs and tissues play roles in multiple systems at once. Circulatory: The job of the circulatory system is to move blood, nutrients, oxygen, carbon dioxide and hormones around the body. It ...

  13. The Organization and Structure of the Human Body

    The Organization and Structure of the Human Body. Cells, the basic building blocks of the human body, make up tissues, which form specialized structures called organs. Organ systems are groups of organs and tissues that all function together towards a single purpose. The human body is made up of a complex structure of systems that all work ...

  14. The Digestive System in the Human Body

    The Stomach. The stomach is an organ of digestion located between the esophagus and the duodenum on the left upper part of the abdominal cavity. It is a muscular, elastic pear-shaped bag lying just below the diaphragm. It is made up of five layers. The innermost layer is referred to as mucosa.

  15. Human body systems

    Unit test. Your body is an amazing system! The human body is made up of groups of organs, called organ systems, that work together to keep the body in balance. In this section, we'll travel from the circulatory system, to the nervous system, to the immune system and beyond. Learn about the amazing biology that keeps your body ticking!

  16. The Respiratory System: [Essay Example], 1432 words

    The lungs which acts as the functional units of the respiratory system by passing oxygen into the body and carbon dioxide out of the body. The third major part is the muscles of respiration, including the diaphragm, which act as a pump, pushing air into and out of the lungs during breathing. The nose (Nasal) is a structure of the face made of ...

  17. The beauty of the human body: [Essay Example], 1544 words

    According to Conway, most agree that three steps are required. First, when people use the media, they accept all ideas about beauty. Second, they start thinking about themselves and compare. Third, they start to change on themselves or work hard on their look (Conway, 2013). Body image and media are not a simple issue because the effects of the ...

  18. PDF Why is Human Anatomy and Physiology so important to your success in a

    Some patients have a thinning (weakening) in the wall of an artery. This is referred to as an aneurysm. The blood in arteries is under very high pressure. This pressure becomes even greater when we are undergoing activity such as exercise. If the wall of the artery is weak and the pressure on the blood increases too much, then the vessel may ...

  19. Essay On Human Body

    Essay On Human Body. 924 Words4 Pages. The human body is an amazing thing made up of many different parts. These parts are cells, tissues, organs, and organ systems. For starters, one type of cell makes up one type of tissue. Next, two or more types of tissues make an organ.

  20. The structure and organization of the human body

    OUTCOME 1. The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing, and is often called the building block of life. It is usually a microscopic structure containing nuclear and cytoplasmic material enclosed by a semi-permeable membrane.

  21. The human body

    essay human anatomy the human body, the physical substance of the human organism, is composed of living cells and extracellular materials and organized into ... For information on the structure and function of the cells that constitute the body, see cell. Many entries describe the body's major structures. For example, see the abdominal cavity ...

  22. (Pdf) Organ-systems: an Essay on A Systematic Approach to Human Organs

    My essay on MEMORY was an introduction to neuroscience and the gross structure of the human brain, while my essay on FEELINGS touched on our emotional systems. ... the average human adult body ...

  23. Blood Circulation in The Human Body

    The three main functions of blood include transport, protection and regulation. Blood transports many different nutrients around the body, blood plays a key role in protection as it decreases inflammation, carries antibodies that destroy bacteria and transports platelets that initiate clotting and finally, blood is useful in regulating the body.

  24. Water and the Body: The Role of Hydration in Human Physiology and Space

    This essay examines the significance of water in the human body, noting that it constitutes about 60% of an adult's body weight, with variations based on age, sex, and body composition. It highlights water's crucial roles in physiological processes such as nutrient transport, temperature regulation, and joint lubrication.

  25. The Fascinating Science Behind the Body Farm

    This essay is about the concept of "body farms" and their crucial role in forensic science and anthropology. It explains how these research facilities, first established by Dr. William Bass in 1981, help study human decomposition under various conditions to improve the accuracy of post-mortem interval (PMI) estimations.

  26. Humans may soon live to be 1000 years old, says renowned scientist

    UNDATED (WKRC) - A renowned scientist claims humans may soon live to be around 1,000 years old. According to BGR, futurist Raymon Kurzweil believes he has found a way to extend the life of a human ...