Human Body Essay
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.
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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Essay On Human Body
Differences and similarities between bullfrog and crayfish.
First the food enters the mouth and then goes to the esophagus where it is pushed down to the first part of the stomach. The first part of the stomach is the cardiac stomach which holds chitinous teeth which grind up the food even more than it has been in the mouth. Then it goes to the pyloric region which is the second part of the stomach where nutrients are sucked out of the food.
Explain How Might The Digestive System And The Circulatory System Work Together
Digested molecules of food, as well as water and minerals from the diet, are absorbed from the cavity of the upper small intestine. Most absorbed materials cross the mucosa into the blood and are carried off in the bloodstream to other parts of the body for storage or further chemical change. As already noted, this part of the process varies with different types of nutrients. 5. 2) Page B13, and #1-4 1.
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The proper functioning of one system relies on the proper functioning of the other system. In other words, the digestive system needs to be in good working order to support the functions of the cardiovascular system. An example of the digestive and cardiovascular systems interrelating is: the first step in digestion of fat is to dissolve it into the intestine where bile acids produced by the liver dissolve the fat into fatty acids and cholesterol. The bile acids join with the fatty acids and cholesterol and vessels then carry the changed fat to the veins of the chest, and the blood carries the fat to storage in different parts of the body.
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The digestive system is responsible for chemically and mechanically breaking down food and includes organs such as, mouth, esophagus, stomach, small intestine, rectum, anus, and additional accessory organs. These organs all aid in the breakdown of food. Food is broken down mechanically by chewing and churning in the stomach, and chemically by acidic enzymes in the stomach and in the small intestine which receives enzymes from the pancreas that are specifically designed for the breakdown of nutrients. Once the food and nutrients are broken down, the excretory system removes whatever the body decides is waste by filtering blood in the nephrons of the kidneys and turning it into urine which is then collected in the bladder and removed from the body when the bladder is
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Macromolecules are essential nutrients that our body needs in order to function. We cannot manufacture theses nutrients, so we must obtain them from our environment. Macromolecules are an essential source in our bodies and they help keep us alive. We call theses building blocks of life carbohydrates, lipids, and proteins. Carbohydrates are made up of sugars, such as glucose, and fructose.
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The Digestive System The digestive system is a system consisting of the mouth, oesophagus, stomach, gallbladder, small intestine, large intestine, the rectum and the anus. The functions of the digestive system are: • To break down food particles into molecules for digestion • To absorb into the bloodstream the small molecules produced by digestion • To eliminate un digested and unabsorbed foodstuffs and other waste products from the body The full digestive process begins at the mouth. The food enters the mouth and is chewed.
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More about Essay On Human Body
Body: What Makes Us Uniquely Human Essay
The human body can be defined as the physical structure of the human organisms. The human body is said to be composed of various components that include the following, two arms, one head, torso, neck and two legs. It is through these physical body components that make us to function. The human body is said to undergo various strategies before it can be fully formed, For example people are made who they are by genes. It is these genes which are said to make us different from each other in the many societies we come from. So before one becomes completely an adult, this body consists of close to 100 trillion cells and all these different functions are said to perform different roles.
The body is also made of many organs which are also said to perform various functions. A good example is the respiratory system and the digestive system. For example the respiratory system is one of the body organs with a specialized function in our bodies. Biologists argue that respiratory system helps in supplying our bodies with blood. This blood is said to carry oxygen which is needed most in our bodies. The respiratory system does this with the help of the breathing system.
When people breathe, we inhale oxygen and carbon dioxide whereby oxygen is taken in the blood while carbon dioxide is breathed out as a waste. So in this case, if the bodies are affected, it means that then the whole body will also be affected. (Bogdan, 2000).
Our bodies are said to be quite unique due to the different roles which are played by our bodies. So, when our bodies are infected by a disease, then it means that our bodies will not be in a position to function well as it is supposed to function. Illnesses are said to make us understand more about our bodies. Our bodies are composed of various immune systems which are supposed to play a vital role in our bodies. This system is quite responsible for fighting off bacteria’s in our bodies and various body infections. It is the role of the immune system which helps in protecting our bodies from the various bacteria’s, viruses plus other harmful organisms that cause diseases in our bodies.
It is during this time that we are in a position to reflect back on our bodies and the various functions which our bodies function. For example, when the body system immune system is not working you find that our bodies are not in a position to function well. This is because of the various functions the immune system plays in our bodies. Our bodies’ immune system works to battle off diseases as fast as they could. The immune system has blood cells.
It is these blood cells which help to fight back these diseases. So when our bodies are infected by a disease, it means that the immune system is not in a position to function well. As a result, our bodies eventually become weak and not able to function well like a healthy person. It is also during this time when we try to reflect back about our bodies are quite unique in the various roles they play. (Bogdan, 2000).
When illness enters in our own body or even that of another say ache, funny feeling, or movement causes us pain or anxiety. These are examples of various body illnesses. Say for example when one has a headache, one is in a position to feel uncomfortable, dizziness and sometimes unconscious. This is because our bodies are made in a way when one part of the body has been interfered with; you find that the whole functioning of our bodies stops.
So, it is during this time when we recognize that our bodies are quite important and necessary action needs to be taken say visiting a doctor unlike other living things say animals. So in this case, the various roles which are played by our bodies makes us uniquely human as when compared with other living things. We are in a position to take care of our bodies by going in to hospitals since when someone is sick, he/she is not in a position to function well. We are unique and also we are more than the multitude of the chemicals substances that are said to make up our physical bodies. We are alive, we feel, act, sense and also think and hence we can be termed as quite unique beings.
When our bodies are unwell, we need even more than the chemical interventions which are the various medicines taken when somebody is ill. We further need more strategies which are supposed to restore back our normal health for the body to start functioning well as usual. So, it is during this time that we need medicines which are aligned to our various body conditions, we also need enough rests and also tender loving care so that our bodies can get humble time to recover from that particular sickness. When our bodies are healthy, our bodies naturally work in order to maintain balance and also to heal itself. So in this case, our inherent tendency to the self heals needs to be highly recognized and also supported when the body is exposed to illness. (Bogdan, 2000).
So it is during this time that we recognize illnesses as a good opportunity for us all. It is during this time that we are reminded that we should take good care of our bodies. We are reminded to take good care of ourselves and also to live in a more balanced way.Illneses can also make us to develop other parts of ourselves. Worked with our illness is said to begin a healing crisis that can lead to a positive change and finally a new direction. (Hamilton, 2006).
Personally I tend to think that there is no clear distinction between the body and the mind. These two things are said to work hand in hand. None is said to exist without the other. This is because a mind can not exist without the body and the body can not exist without the mind. Although this point can be debatable, many argue that there is no clear distinction between the two. They are said to function together. A good example is that our minds are made of sensory organs which are said to dictate what the rest of the body has to do.
For example raising ones hand in order to ask a question in class? How will this body sense organs cause sensation to the sensory organs in the mind if the two were quite different. It means that there will be no connection between the two and the various body functions will not be in a position to function since the sensory organs are said to dictate the body what to do. (Hamilton, 2006).
So, in this case, we found that the body is united with the mind in order to make human beings. None is said to exists without the other since there roles are said to go together.” We are neutral beings”. “Our brains are said to take their inputs from the rest of our bodies, what our bodies are said to be and how they are said to function in the world thus structures the very concepts we can use to think, we can not just think anything only what our embodied brains are said to permit”. So the mind is said to be one of the roles our bodies’ play which makes us uniquely human. It is by the role of the mind that our bodies are in a position to function well. Human beings are endowed with minds to think unlike other living creatures say animals. So, it is the role of the mind that is said to make human beings quite unique and important. (Hamilton, 2006).
Human beings are said to be unique due to the various roles which are played by our bodies. Our bodies are said to perform various functions. So, incase our bodies are exposed to threats or even diseases, it means that we are not able to function well. So it is during this time that we are reminded of our bodies. So, we are supposed to take good case of our bodies since we are unique. It only happens when these bodies are exposed to the various illnesses so it’s said to be a good time to reflect back on our bodies and try to treat them well.
Hamilton, M 2006,”The vital role that our immune systems play”. EzineArticles 12.
Couser, G 1997, Recovering bodies: Illnesses, disability and fife writing, Madison, University of Wisconsin.
Bogdan, R 2000, Human bodies. Chicago, University of Chicago Press.
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IvyPanda. (2021, August 18). Body: What Makes Us Uniquely Human. https://ivypanda.com/essays/body-what-makes-us-uniquely-human/
"Body: What Makes Us Uniquely Human." IvyPanda , 18 Aug. 2021, ivypanda.com/essays/body-what-makes-us-uniquely-human/.
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IvyPanda . 2021. "Body: What Makes Us Uniquely Human." August 18, 2021. https://ivypanda.com/essays/body-what-makes-us-uniquely-human/.
1. IvyPanda . "Body: What Makes Us Uniquely Human." August 18, 2021. https://ivypanda.com/essays/body-what-makes-us-uniquely-human/.
IvyPanda . "Body: What Makes Us Uniquely Human." August 18, 2021. https://ivypanda.com/essays/body-what-makes-us-uniquely-human/.
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Review: Introduction to the Human Body
Here is what we have learned from Introduction to the Human Body :
- The human body is a single structure but it is made up of billions of smaller structures of four major kinds: cells, tissues, organs, and systems.
- An organ is an organization of several different kinds of tissues so arranged that together they can perform a special function.
- A system is an organization of varying numbers and kinds of organs so arranged that together they can perform complex functions for the body.
- Ten major systems include the skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, and the reproductive system.
- Body functions are the physiological or psychological functions of body systems. Survival of the body depends on the body's maintaining or restoring homeostasis, a state of relative constancy, of its internal environment.
- Human life process includes organization, metabolism, responsiveness, movements, reproduction, growth, differentiation, respiration, digestion, and excretion. All these processes work together, in fine-tuned balance, for the well-being of the individual and to maintain life.
- Life depends on certain physical factors from the environment, which include water, oxygen, nutrients, heat, and pressure.
- Directional terms
- Terms describing planes of the body
- Terms describing body cavities
Human Anatomy - Essay Examples And Topic Ideas For Free
Human anatomy is the scientific study of the body’s structures, including the skeletal, muscular, and organ systems. Essays on human anatomy might explore the major systems of the human body, the recent advancements in understanding human anatomy, and the implications of these advancements for medicine and healthcare. Moreover, discussions could delve into the historical evolution of anatomical knowledge, the intersection of anatomy with art, and the ethical considerations in anatomical research and education. Analyzing the methodologies used in anatomical study, comparing human anatomy with the anatomy of other organisms, and examining the portrayal of human anatomy in cultural and societal contexts can provide a rich exploration of this fundamental scientific discipline. A substantial compilation of free essay instances related to Human Anatomy you can find in Papersowl database. You can use our samples for inspiration to write your own essay, research paper, or just to explore a new topic for yourself.
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The respiratory system is the bodies system that introduces gases into the body and releases waste gases through breathing. The main function is to transport air into the lungs, facilitate the diffusion of oxygen into the blood stream, and exhale carbon dioxide from the blood through exhaling. The respiratory system consists of all the organs involved in breathing. These include the nose, pharynx, larynx, trachea, bronchi and lungs. The mouth, nose, and nasal cavity function is to warm, filter, and […]
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Chemistry of Human Body
The body and its elements.
The body contains more than 60 elements, however its massive section has solely four of them, carbon, nitrogen, oxygen and hydrogen. They are all beneficial in special ways ranging from the blood, tissues and muscles improvement as well as nutrient processes. In this essay, I shall discuss six factors among them being carbon, oxygen, nitrogen, hydrogen, calcium and iron.
Carbon is the fundamental constructing material of life on the planet. One of the motives as to why this is true is because of its capacity of making four bonds to the nearby atoms and can effortlessly unite with other carbon atoms and thus make it an essential building block. The process then becomes critical to the life creation of constituent such as lipids, proteins, carbohydrates and the nucleic acids such as DNA and RNA.
Carbon nanotubes can also assemble themselves and create a structure that is strong have electrical, thermal and optical properties. it is the only backbone for different molecules with the traits required for organisms. Its bonds are firm to the point of resisting environmental stresses but also weak for manipulation by enzymes in our bodies, which is a metabolism requirement. When we eat, the food is either converted into muscles or fats depending on our levels of exercise, this conversion is either breaking or forming bonds, and the energy we gain gets stored in the carbon-based molecules within our bodies, and this is a requirement for life (Simms & Zamponi, 2014, p.24).
Some of the functional groups include alcohol: it is a biomolecule containing at least one hydroxyl group (R-OH) which adds polarity to the organic molecules due to its intense nature of electronegativity of the oxygen atoms, and this makes most alcohol to dissolve in water through the formation of hydrogen bonds. Another group is the carbonyl which increases polarity and also the reactivity of organic molecules. They tend to be volatile and stimulates the human sense with either pleasant or unpleasant smell. Other groups include carboxyl, amines and the phosphate groups. When carbon burn in the air, it forms carbon dioxide (C+O2 →CO2). But when there is air restriction, it forms carbon monoxide CO (g). Again, when it reacts with water under forcing conditions, it forms CO and hydrogen H2 (C+H2O→CO+ H2). The reaction is endothermic. Carbon also reacts with halides to give carbon halides. For instance, reaction with fluoride (C+ F2 → CF4 + C2F6 + C5F12).
Hydrogen makes an approximate of 90% of all atoms and is essential in the body operations. One of the used ways is through the water which is made up of two-thirds of it. The body is made up of up to 60% of water and hydrogen helps the cells to remain hydrated; eliminate toxins and other wastes; transport nutrients lubricates the joints and supports the immune system in sending defensive cells to battle the infection-causing fungus, viruses and bacteria (Ito & Suda, 2014, p.243). It also plays a fundamental role in the energy production, for the body to function, it requires adenosine triphosphate (ATP) energy. The mitochondria of the cells receives hydrogen ion which helps in the formation of the ATP.
Water molecules pull each other; the plus side attracts the minus of the other and also that of the oxygen atom. Another example of the interactions is the weak bond that exists between the hydrogen partial positive side and a more electromagnetic atom like oxygen. Water molecules also get enticed to other ions and polar molecules. Such are called hydrophilic, and the non-polar called hydrophobic. Some of the groups of hydrogen include halogens which contain halogen bonds; hydroxyl with oxygen bonds; those containing nitrogen and also others containing sulfur. Also, some groups have phosphorous and others boron elements. Hydrogen has one electron in its outside octet. During the formation of a molecule, two atoms combine. Both of them feel the attraction of the two electrons held by each and thus forming the covalent bonds. Hydrogen has an atomic number 1, mass of 1.007825g.mol-1, negativity of 2.1 according to Pauling; density of 0.0899×10 -3 g/cm -3 at a temperature of 20 °C; the melting point should be -259.20C, boiling point -252.80c. Moreover, other properties include the ionic radius of 0.208 (-1) nm, three isotopes and 1s1 electronic shells. The bond of hydrogen can only be formed by dipole-dipole between the negative atoms and a hydrogen atom that attaches to a donor. Some of the only atoms that can form a hydrogen bond donor include fluorine and nitrogen. Here is an illustration with oxygen (2 H2 + O2 2 H2O). But an acceptor can be any atom as long as it is a polar bond, electronegative and has a lone pair with the example of carbon (C3H8+ 5 O2 3 CO2+ 4 H2O).
The human body needs nitrogen in forms of amino acids, from proteins to manufacture other amino acids that it utilizes in synthesizing. And if not used in the synthesis of protein, then they are broken into energy. Human tissues contain proteins, and the metabolic process depends on the enzymes consisting of different types of proteins (Davila, et al. 2013, p.114). Nucleic acids in the DNA and RNA also has nitrogen. Tissue repairs and cell replacements all require nitrogen for the production of new cells. It can also be used to make heme in the hemoglobin which helps in carrying oxygen in the red blood cells.
Nitrogen makes up to 80% of the atmosphere and interacts in two ways; through soil bacteria that form nitrates and through lightning. Plants take the nitrates, converts it into proteins which then ends up to the herbivores and carnivores and after excretion, it is released back to the atmosphere. Human being causes the nitrogen deposition through the burning of fuels, ranching and fertilizing of crops among others. The gas has a wide range of functional groups such as nitrate, nitrites, amides, amines, carbodiimides, enamines, hydrazine, hydrazones, imines, oximes and urea among others. Some of the characteristics of nitrogen atoms include the atomic mass of seven, the electronegativity of three according to Pauling. Moreover, the density is 1.25×10-3 g/cm-3 at the temperature of 20°C; a melting point of -2100C, the boiling point of 195.80C; the van der Waals radius of 0.092nm and ionic radius of 0.171 nm (-3). Other characteristics includes: 4 isotopes, [He] 2s22p3 electronic shell, 1402 kJ.mol -1, 2856 kJ.mol -1 and 4578 kJ.mol -1 (first, second and third ionization energy respectively) (Masa, et al. 2015, p.10102).
Covalent bonding is the sharing of electron pairs, nitrogen has five valence electrons, and thus it needs three more to complete its octet. For instance; Nitrogen reacts with some few metals to display a reducing property, for instance (6Li + N2 2Li3N) it also reacts with hydrogen at 4000C and 200 atmosphere as 3H2 + N2 2NH3. It does not react with many halogens and sulfides. Nitrogen also reacts with oxygen to give: N2O (ni¬trous ox¬ide); NO (ni¬tric ox¬ide); N2O3 (dini¬tro¬gen tri¬ox¬ide); NO2 (ni¬tro¬gen diox¬ide) and N2O5 (ni¬tro¬gen pen¬tox¬ide).
Oxygen is absorbed in the human body through the bloodstreams to the lungs, then transported to the cells where changes take place. It has a vital role in the breathing and metabolism processes of living organisms; it supports the cell respiration in all aerobic creatures. Nutrient compounds usually get through enzymatic operations, and this oxidation becomes a source of energy for many animals especially mammals. The heat is then kept as adenosine triphosphate (ATP) in the mitochondria transport chain and also in cytoplasm and glycolysis. Oxygen interacts with plants; it is produced at daytime when making food and consumed at night (Prabhakar & Peers, 2014, p. 49). The results after consumption are the releases of carbon (IV) oxide. Oxygen molecules break to form two ions that then combine with other oxygen molecules to create the ozone; made up of three atoms. We find it in functional groups such as alcohols (with (R-OH)), amines (contains amino groups (R-NH2)), carbonyls and carboxyls (with carboxyl groups (R-COOH)) and phosphates (with (R-PO42–)). In the outermost shell, oxygen has six electrons, and thus it requires two to complete the octet. One atom then combines with another lacking the two electrons and therefore forms the covalent bond as shown in the figure below.
The atom has an electronegativity of 3.5 according to Pauling and a density of 1.429 kg/m3 at a temperature of 20°C, melting of -2190C and boiling point of -1830C. It also has vanderwaals radius of 0.074nm, ionic radius of 0.14nm (-2), 4 isotopes and the electronic shell ([He] 2s 2 2p 4) (Singer, 2014, p.66). Oxygen reacts with non-metals to form oxides, for example with nitrogen to give: N2O (nitrous ox¬ide); NO (ni¬tric ox¬ide); N2O3 (dini¬tro¬gen tri¬ox-ide); NO2 (ni¬tro¬gen diox¬ide) and N2O5 (ni¬tro¬gen pen¬tox¬ide). It also reacts with metals to give metal oxides, for instance with magnesium. (Mg+O2 MgO). Reacts with hydrogen to form water H2O.
Calcium and Iron
Calcium is vital for the blood clotting, stabilizing the pressure and contributes to the normal function of the brain. It also helps in building bones and muscle contractions. Iron is also an essential factor of hemoglobin, and without it, it would be difficult to carry oxygen to the cells (Abbaspour, et. al. 2014, p.164). Anemia is the problem of iron deficiency with characteristics of overall poor health. Iron also regulates the growth and developments of cells, maintain a healthy immune system and promote a better brain function. The melting and boiling points of calcium are 850°C and 1,440°C respectively and density of 1.54 g/cm3.
Most of the reactions of iron and Calcium follow the same trend, for example; they react with oxygen to form oxides (Fe2O3 and CaO); with water (Ca+ 2H2O → Ca(OH)2 + H2); halogens to form fluoride with example of fluorine (Ca + F2 → CaF2 and reaction with acid (Ca + 2HCl → Ca2+ 2Cl- + H2). Calcium has six isotopes (40, 42, 43, 44, 46, and 48) and has compounds such as limestone and slag and iron has four isotopes (54, 56, 57 and 58). These two elements do not make bond covalently but have an ionic one. Calcium has an electron configuration of 1s22s22p63s23p64s2 and iron 1s2 2s2 2p6 3s2 3p6 4s2 3d6. As seen above, elements are beneficial and vital for the human survival, and thus people should ensure they consume them in large quantities; they increase the overall health of human and other organisms. Different elements have different properties and roles as seen.
Abbaspour, N., Hurrell, R. and Kelishadi, R., 2014. Review on iron and its importance for human health. Journal of research in medical sciences: the official journal of Isfahan University of Medical Sciences, 19(2), p.164. Davila, A.M., Blachier, F., Gotteland, M., Andriamihaja, M., Benetti, P.H., Sanz, Y. and Tomé, D., 2013. Re-print of “Intestinal luminal nitrogen metabolism: Role of the gut microbiota and consequences for the host”. Pharmacological research, 69(1), pp.114-126. Ito, K. and Suda, T., 2014. Metabolic requirements for the maintenance of self-renewing stem cells. Nature reviews Molecular cell biology, 15(4), pp.243-256. Prabhakar, N.R. and Peers, C., 2014. Gasotransmitter regulation of ion channels: a key step in O2 sensing by the carotid body. Physiology, 29(1), pp.49-57. Masa, J., Xia, W., Muhler, M. and Schuhmann, W., 2015. On the Role of Metals in Nitrogen‐Doped Carbon Electrocatalysts for Oxygen Reduction. Angewandte Chemie International Edition, 54(35), pp.10102-10120. Simms, B.A. and Zamponi, G.W., 2014. Neuronal voltage-gated calcium channels: structure, function, and dysfunction. Neuron, 82(1), pp.24-45. Singer, M., 2014. The role of mitochondrial dysfunction in sepsis-induced multi-organ failure. Virulence, 5(1), pp.66-72.
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The Human Body The human body is made up of a number of different systems. Each system has a separate function, but some work together. One system is the skeleton, which serves to support the body and protect the internal organs. The respiratory system enables us to breathe and take oxygen into the blood, which moves around the body by means of the circulatory system. The digestive system enables us to take in food needed for growth. Waste matter is ejected from the body by means of the urinary system. The nervous system controls the other systems and enables human beings to think. The endocrine system consists of various glands, such as the thyroid, sex and adrenal glands. The function of these glands is to secrete chemicals, known as hormones, into the blood. These hormones control various processes in the body, such as growth, sexual activities and digestion.. Each system is made up of organs. The lungs, for example, are part of the respiratory system. The heart is an organ in the circulatory system. The liver functions as part of the digestive system and other systems. Every organ is composed of several kinds of tissue. Epithelial tissue, which includes the skin, forms a covering over organs. Connective tissue supports and holds together parts of the body and includes bone and cartilage. Other types of tissue include nerve tissue and blood tissue. All tissue consists of cells. These are so small that they are measured in thousandths of a millimeter and can only be seen with a microscope. Each cell is covered with a thin membrane which surrounds a nucleus, and a jelly-like substance, called cytoplasm. This in turn contains minute particles, each with its own special function.
In this essay, the author
- Explains that the human body is made up of a number of different systems.
- Explains that the skeleton supports the body and protects internal organs. the respiratory system allows us to breathe and take oxygen into the blood, and the digestive system takes in food needed for growth.
- Explains that the endocrine system consists of thyroid, sex, and adrenal glands. they secrete chemicals, known as hormones, into the blood.
- Explains that each system is made up of organs, such as the lungs, the heart, and the liver.
- Explains that every organ is composed of several kinds of tissue, including epithelial tissue and connective tissue.
- Explains that all tissue consists of cells, which are so small that they can only be seen with a microscope.
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