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From Wikipedia, the free encyclopedia

The human body is the structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organ systems. They ensure homeostasis and the viability of the human body.

It comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet.

The study of the human body involves anatomy, physiology, histology and embryology. The body varies anatomically in known ways. Physiology focuses on the systems and organs of the human body and their functions. Many systems and mechanisms interact in order to maintain homeostasis, with safe levels of substances such as sugar and oxygen in the blood.

The body is studied by health professionals, physiologists, anatomists, and by artists to assist them in their work.

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  • ✪ Most USELESS Human Body Parts!
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  • ✪ 5 most important organs in the Human body - Human Anatomy | Kenhub

Transcription

From wisdom teeth to your tailbone, here are 13 of the most useless body parts! 13. Wisdom Teeth Wisdom teeth are the third and final set of molars that most people get in their late teens or early twenties. With all the money spent on removing them and all the pain that one has to endure during the process, it’s frustrating to know that wisdom teeth don’t serve any practical purpose. They are simply the remnants our ancestors’ teeth, who had larger jaws than we currently do. The reason why wisdom teeth have no use anymore is because human jaws have become smaller as they evolved, leaving little space for wisdom teeth to grow in comfortably. Another theory suggests that early humans used to lose their teeth quickly as they aged, so wisdom teeth could take the place of lost teeth and allow them to eat normally (and thus survive) for longer. Now they just cause all kinds of problems if they are misaligned such as jaw and nerve damage as well as infections that can be extremely painful. 12. Body Hair and Arrector Pili We all know about body hair, but what exactly are arrector pili? These are the smooth muscle fibers that give humans the peculiar sensation we commonly call “goose bumps”. If the arrector pili are activated, hair that come out of the nearby follicles stands up, giving us those famous goose bumps on our skin. Goose bumps are important to certain animals (like cats), which use those hairs on the body to swell up and make themselves look ‘bigger’ than they actually are. But human body hair is so small and fine that it does little more than give us a shiver, or let us know that something is frightening us! Yes, you can say that body hair protects us from the cold, and the hair on our head may help you look stylish, but that’s about it for legitimate functions of human body hair and arrector pili. 11. Eyebrows The evolutionary purpose of eyebrows is debatable: In one camp, scientists believe brows keep sweat and rain off your eyes, which would help in primitive hunting and navigation. Moreover, diverting the sweat away is also beneficial as the salt in sweat irritates the eyes, making them sting. Other scientists favor the hypothesis that eyebrows serve to communicate your emotions, but they may also communicate your identity. Behavioral neuroscientists from MIT found that people were less likely to recognize pictures of celebrities without their eyebrows than without their eyes. The researchers speculate that eyebrows have remained because they’re crucial to identifying faces and navigating social circumstances. 10. Tailbone/Coccyx Although we don’t sport these animalian appendages anymore, our ancestors once had tails. Tails were used to maintain balance while we walked, but as the human body evolved, the need for a tail disappeared. The tailbone, or coccyx, is situated at the end of the spinal cord. When we did have tails, this part of our anatomy was vital to our survival and balance. However, as tails disappeared, so did the functions of the tailbone. While we don’t really need it, it has been suggested that the coccyx helps to anchor minor muscles and may support the pelvic organs, so, it’s better to not underestimate its existence in the human body. 9, Male Nipples This has been a topic of significant discussion over the years, and has sparked all kinds of weird arguments, one even stating that ‘men have descended from women’. This isn’t true, but if you want to know the real reason behind male nipples, one has to go pretty far back, all the way to your time as a fetus. Both men and women have nipples because in the early stages of fetal development, an unborn child is effectively sexless meaning it has no gender yet. Thus, nipples are present on both males and females. During the later stages of fetal development, it is ‘testosterone’, a hormone, that decides the gender of the fetus – either male or female. It should be noted that certain males have been found to lactate and there have been numerous cases of breast cancer in males. 8, Third Eyelid This is the part of the eye that you can see at the corner of the eye (next to the tear duct). Although certain animals, like dogs, reptiles and fish, need it for a variety of functions and protected vision, humans do not need this third eyelid to maintain proper vision or survival. This doesn’t mean that the third eyelid does nothing and just sits there. When we move our eyes, the third eyelid (plica semilunaris) ensures proper tear drainage and sweeps debris away from the eye. For anyone who has ever walked along a windy beach, we can appreciate that particular function, right? 7. Darwin’s Point Around the sixth week of gestation, six swellings of tissue called the Hillocks of Hiss arise around the area that will form the ear canal. These eventually come together to form the outer ear. Darwin’s point, or tubercle, is a minor malformation of the junction of the fourth and fifth Hillocks of Hiss. It is found in a minority of people and takes the form of a node or bump on the rim of their outer ear, which is thought to be the vestige of a joint that allowed the top part of the ancestral ear to swivel or flop down over the opening to the ear. Technically considered a defect, Darwin’s point does no harm and is surgically removed for cosmetic reasons only. However, the genetics behind it tells an interesting tale. The trait is passed on according to an autosomal dominant pattern, meaning that a child needs to only inherit one copy of the gene responsible to have Darwin’s point. That suggests that at one time it was useful. However, it also has variable penetration, meaning that you won’t necessarily have the trait even if you inherit the gene. 6. Philtrum No, that little indent under your nose isn’t there to make it difficult to apply lipstick in the dark, but it doesn’t serve any other purpose either. The indent, called the philtrum, is just a residual reminder of your time in the womb: in utero, the two sides of your face develop independent of one another, then join at the middle. When the two sides fail to fuse properly, the result is a cleft palate, which occurs in about 1 of every 750 births. Ancient Romans found the philtrum erotic, and named that dip in the upper lip the “Cupid’s Bow.” In fact, the word philtrum comes from a Greek term meaning “love potion.” If you’ve seen makeup tutorials on YouTube, you will know that women still highlight their cupid’s bow to emphasize it, but they may not know exactly why! 2000 years later, it’s still sexy! 5. Auricular muscles The auricular, or extrinsic, muscles of the human ear include the anterior auricular muscle, the superior auricular muscle, and the posterior auricular muscle. Together, they control the pinna, or the visible part of the ear. In many mammals, ear movements produced by the auricular muscles play a role in sound localization and the expression of emotion. You must have noticed your pets perking up their ears when startled or lay them back flat if they are listening or embarrassed. These extrinsic ear muscles are used to perk up their ears as a sign of alertness or to move them around according to motion of predators or prey. But in humans, the muscles are considered nonfunctional. Darwin proposed that humans effectively capture sounds by positioning the head to receive them, thereby compensating for the loss of or eliminating the need for the auricular muscles. Through repeated effort, however, humans can recover some ability to wiggle their ears, if that is a goal of yours. 4. Fifth Toe Have you often been injured by furniture, especially on that all too useless pinky toe? You are not the only one then who has been exposed to it being more of a disadvantage! Used primarily by primates and our tree hugging ancestors for clinging and swinging off branches, they have greatly reduced in size now and have become entirely obsolete. Not required for balance, or mobility in any way; the fifth toe is a body part we don’t really need. Several mammals have already lost their digits thanks to evolution such as cows, horses, pigs and camels and have hooves instead. If humans were to follow and lose their pinky toe, it wouldn’t make much difference except maybe much better fitting shoes! 3. Tonsils One of the most removed organs, tonsils are basically collections of lymphoid tissue, one on each side of the back of the throat. They do function as a part of your immune system fighting infections as the first in line for defence in the throat. The major problem with its bacteria fighting effect is its tendency to get sore and inflamed and get recurring infections. If the infection is virus initiated, antibiotics don’t help and doctors almost always recommend getting tonsil removal surgery called a tonsillectomy. So for many people the tonsils aren’t even that helpful to begin with! 2. Chins Who knew a body part could be such a hot topic? It turns out there are endless debates when it comes to whether or not the chin has a purpose. It becomes even stranger when you consider that among all the primates – including our extinct relatives – only we have chins. Chimpanzee and ape jaws slant inwards for instance. Even our closest extinct relatives such as Neanderthals did not have them. Nobody seems to know why – although over the last century several theories as to its purpose have been offered. To start with it has long been proposed that our chin may help us chew food. The theory goes that we need the extra bone to deal with the stresses involved with chewing. However, this idea falls flat when you compare us to other great apes with similar-shaped jaws. When we chew, our jaw gets pulled apart a bit like a wishbone and the further apart our jaws are the weaker the bones are. If we were to protect ourselves from the stresses of chewing we would need more bone on the inner wall of the jaw near the tongue, not beneath our jaw. That's exactly what you see in chimpanzees and macaques. They have extra bone on the tongue-ward side of their lower jaw, called a "simian shelf", which we do not have. The added bone that forms our chin is not very useful for additional chewing strength. While it has no obvious function, it might simply be there because we like it—the result of sexual selection. While some experts believe that the chin helps us control the forces our jaw produces when we chew, the Iowa Facial Growth Study determined that "chins are unlikely related to the need to dissipate stresses and strains." 1. Appendix This is an organ located at the junction of the large and small intestines. Since it is connected to the intestines, many people think it plays some role in the digestive process, but it serves no purpose whatsoever. At least, as far as we know. The main function of the appendix in other species is to aid in digestion for diets that are largely herbivorous. This is why the appendix is an important part of digestion in plant-eating vertebrates. But in humans, it doesn’t seem to do anything. A study in 2009 showed some signs that the appendix may store good bacteria that can help people suffering from digestion issues. But so does the small intestine. Most medical practitioners believe it is a useless part left over from our evolutionary past. What we do know, is that it can become inflamed and rupture. In severe cases of appendicitis it has to be removed or you can die! Pretty scary for something that is just sitting in your body doing nothing the rest of the time. There are no known health problems from having your appendix removed. Thanks for watching! Remember to subscribe and click here for more videos! See you next time! Bye!

Contents

Composition

Elements of the human body by mass. Trace elements are less than 1% combined (and each less than 0.1%).
Elements of the human body by mass. Trace elements are less than 1% combined (and each less than 0.1%).

The human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus.[1] These elements reside in trillions of cells and non-cellular components of the body.

The adult male body is about 60% water for a total water content of some 42 litres. This is made up of about 19 litres of extracellular fluid including about 3.2 litres of blood plasma and about 8.4 litres of interstitial fluid, and about 23 litres of fluid inside cells.[2] The content, acidity and composition of the water inside and outside cells is carefully maintained. The main electrolytes in body water outside cells are sodium and chloride, whereas within cells it is potassium and other phosphates.[3]

Cells

The body contains trillions of cells, the fundamental unit of life.[4] At maturity, there are roughly 30[5]–37[6] trillion cells in the body, an estimate arrived at by totaling the cell numbers of all the organs of the body and cell types. The body is also host to about the same number of non-human cells[5] as well as multicellular organisms which reside in the gastrointestinal tract and on the skin.[7] Not all parts of the body are made from cells. Cells sit in an extracellular matrix that consists of proteins such as collagen, surrounded by extracellular fluids. Of the 70 kg weight of an average human body, nearly 25 kg is non-human cells or non-cellular material such as bone and connective tissue.[5]

Cells in the body function because of DNA. DNA sits within the nucleus of a cell. Here, parts of DNA are copied and sent to the body of the cell via RNA.[8] The RNA is then used to create proteins which form the basis for cells, their activity, and their products. Proteins dictate cell function and gene expression, a cell is able to self-regulate by the amount of proteins produced.[9] However, not all cells have DNA – some cells such as mature red blood cells lose their nucleus as they mature.

Tissues

The body consists of many different types of tissue, defined as cells that act with a specialised function.[10] The study of tissues is called histology and often occurs with a microscope. The body consists of four main types of tissues – lining cells (epithelia), connective tissue, nervous tissue and muscle tissue.[11]

Cells that lie on surfaces exposed to the outside world or gastrointestinal tract (epithelia) or internal cavities (endothelium) come in numerous shapes and forms – from single layers of flat cells, to cells with small beating hair-like cilia in the lungs, to column-like cells that line the stomach. Endothelial cells are cells that line internal cavities including blood vessels and glands. Lining cells regulate what can and can't pass through them, protect internal structures, and function as sensory surfaces.[11]

Organs

Organs, structured collections of cells with a specific function,[12] sit within the body. Examples include the heart, lungs and liver. Many organs reside within cavities within the body. These cavities include the abdomen and pleura.

Systems

Diagram of the human heart (cropped).svg

Circulatory system

The circulatory system comprises the heart and blood vessels (arteries, veins and capillaries). The heart propels the circulation of the blood, which serves as a "transportation system" to transfer oxygen, fuel, nutrients, waste products, immune cells and signalling molecules (i.e., hormones) from one part of the body to another. The blood consists of fluid that carries cells in the circulation, including some that move from tissue to blood vessels and back, as well as the spleen and bone marrow.[13][14][15]

Stomach colon rectum diagram-en.svg

Digestive system

The digestive system consists of the mouth including the tongue and teeth, esophagus, stomach, (gastrointestinal tract, small and large intestines, and rectum), as well as the liver, pancreas, gallbladder, and salivary glands. It converts food into small, nutritional, non-toxic molecules for distribution and absorption into the body.[16]

Illu endocrine system.png

Endocrine system

The endocrine system consists of the principal endocrine glands: the pituitary, thyroid, adrenals, pancreas, parathyroids, and gonads, but nearly all organs and tissues produce specific endocrine hormones as well. The endocrine hormones serve as signals from one body system to another regarding an enormous array of conditions, and resulting in variety of changes of function.[17]

PBNeutrophil.jpg

Immune system

The immune system consists of the white blood cells, the thymus, lymph nodes and lymph channels, which are also part of the lymphatic system. The immune system provides a mechanism for the body to distinguish its own cells and tissues from outside cells and substances and to neutralize or destroy the latter by using specialized proteins such as antibodies, cytokines, and toll-like receptors, among many others.[18]

Skin-no language.PNG

Integumentary system

The integumentary system consists of the covering of the body (the skin), including hair and nails as well as other functionally important structures such as the sweat glands and sebaceous glands. The skin provides containment, structure, and protection for other organs, and serves as a major sensory interface with the outside world.[19][20]

Sobo 1909 605.png

Lymphatic system

The lymphatic system extracts, transports and metabolizes lymph, the fluid found in between cells. The lymphatic system is similar to the circulatory system in terms of both its structure and its most basic function, to carry a body fluid.[21]

Skelett-Mensch-drawing.jpg

Musculoskeletal system

The musculoskeletal system consists of the human skeleton (which includes bones, ligaments, tendons, and cartilage) and attached muscles. It gives the body basic structure and the ability for movement. In addition to their structural role, the larger bones in the body contain bone marrow, the site of production of blood cells. Also, all bones are major storage sites for calcium and phosphate. This system can be split up into the muscular system and the skeletal system.[22]

Human brain NIH.jpg

Nervous system

The nervous system consists of the central nervous system (the brain and spinal cord) and the peripheral nervous system consists of the nerves and ganglia outside the brain and spinal cord. The brain is the organ of thought, emotion, memory, and sensory processing, and serves many aspects of communication and controls various systems and functions. The special senses consist of vision, hearing, taste, and smell. The eyes, ears, tongue, and nose gather information about the body's environment.[23]

Male anatomy.png

Reproductive system

The reproductive system consists of the gonads and the internal and external sex organs. The reproductive system produces gametes in each sex, a mechanism for their combination, and in the female a nurturing environment for the first 9 months of development of the infant.[24]

Heart-and-lungs.jpg

Respiratory system

The respiratory system consists of the nose, nasopharynx, trachea, and lungs. It brings oxygen from the air and excretes carbon dioxide and water back into the air.[25]

Gray1120.png

Urinary system

The urinary system consists of the kidneys, ureters, bladder, and urethra. It removes toxic materials from the blood to produce urine, which carries a variety of waste molecules and excess ions and water out of the body.[26]

Anatomy

Cavities of human body
Cavities of human body

Human anatomy is the study of the shape and form of the human body. The human body has four limbs (two arms and two legs), a head and a neck which connect to the torso. The body's shape is determined by a strong skeleton made of bone and cartilage, surrounded by fat, muscle, connective tissue, organs, and other structures. The spine at the back of the skeleton contains the flexible vertebral column which surrounds the spinal cord, which is a collection of nerve fibres connecting the brain to the rest of the body. Nerves connect the spinal cord and brain to the rest of the body. All major bones, muscles, and nerves in the body are named, with the exception of anatomical variations such as sesamoid bones and accessory muscles.

Blood vessels carry blood throughout the body, which moves because of the beating of the heart. Venules and veins collect blood low in oxygen from tissues throughout the body. These collect in progressively larger veins until they reach the body's two largest veins, the superior and inferior vena cava, which drain blood into the right side of the heart. From here, the blood is pumped into the lungs where it receives oxygen and drains back into the left side of the heart. From here, it is pumped into the body's largest artery, the aorta, and then progressively smaller arteries and arterioles until it reaches tissue. Here blood passes from small arteries into capillaries, then small veins and the process begins again. Blood carries oxygen, waste products, and hormones from one place in the body to another. Blood is filtered at the kidneys and liver.

The body consists of a number of different cavities, separated areas which house different organ systems. The brain and central nervous system reside in an area protected from the rest of the body by the blood brain barrier. The lungs sit in the pleural cavity. The intestines, liver, and spleen sit in the abdominal cavity

Height, weight, shape and other body proportions vary individually and with age and sex. Body shape is influenced by the distribution of muscle and fat tissue.[27]

Physiology

Human physiology is the study of how the human body functions. This includes the mechanical, physical, bioelectrical, and biochemical functions of humans in good health, from organs to the cells of which they are composed. The human body consists of many interacting systems of organs. These interact to maintain homeostasis, keeping the body in a stable state with safe levels of substances such as sugar and oxygen in the blood.[28]

Each system contributes to homeostasis, of itself, other systems, and the entire body. Some combined systems are referred to by joint names. For example, the nervous system and the endocrine system operate together as the neuroendocrine system. The nervous system receives information from the body, and transmits this to the brain via nerve impulses and neurotransmitters. At the same time, the endocrine system releases hormones, such as to help regulate blood pressure and volume. Together, these systems regulate the internal environment of the body, maintaining blood flow, posture, energy supply, temperature, and acid balance (pH).[28]

Development

baby (infant)
baby (infant)

Development of the human body is the process of growth to maturity. The process begins with fertilisation, where an egg released from the ovary of a female is penetrated by sperm. The egg then lodges in the uterus, where an embryo and later fetus develop until birth. Growth and development occur after birth, and include both physical and psychological development, influenced by genetic, hormonal, environmental and other factors. Development and growth continue throughout life, through childhood, adolescence, and through adulthood to senility, and are referred to as the process of ageing.

Society and culture

Professional study

Anatomical study by Leonardo da Vinci
Anatomical study by Leonardo da Vinci

Health professionals learn about the human body from illustrations, models, and demonstrations. Medical and dental students in addition gain practical experience, for example by dissection of cadavers. Human anatomy, physiology, and biochemistry are basic medical sciences, generally taught to medical students in their first year at medical school.[29][30][31]

Depiction

Figure drawing by Lovis Corinth (before 1925)
Figure drawing by Lovis Corinth (before 1925)

Anatomy has served the visual arts since Ancient Greek times, when the 5th century BC sculptor Polykleitos wrote his Canon on the ideal proportions of the male nude.[32] In the Italian Renaissance, artists from Piero della Francesca (c. 1415–1492) onwards, including Leonardo da Vinci (1452–1519) and his collaborator Luca Pacioli (c. 1447–1517), learnt and wrote about the rules of art, including visual perspective and the proportions of the human body.[33]

History of anatomy

Two facing pages of text with woodcuts of naked male and female figures, in the Epitome by Andreas Vesalius, 1543
Two facing pages of text with woodcuts of naked male and female figures, in the Epitome by Andreas Vesalius, 1543

In Ancient Greece, the Hippocratic Corpus described the anatomy of the skeleton and muscles.[34] The 2nd century physician Galen of Pergamum compiled classical knowledge of anatomy into a text that was used throughout the Middle Ages.[35] In the Renaissance, Andreas Vesalius (1514–1564) pioneered the modern study of human anatomy by dissection, writing the influential book De humani corporis fabrica.[36][37] Anatomy advanced further with the invention of the microscope and the study of the cellular structure of tissues and organs.[38] Modern anatomy uses techniques such as magnetic resonance imaging, computed tomography, fluoroscopy and ultrasound imaging to study the body in unprecedented detail.[39]

History of physiology

The study of human physiology began with Hippocrates in Ancient Greece, around 420 BC,[40] and with Aristotle (384–322 BC) who applied critical thinking and emphasis on the relationship between structure and function. Galen (c. 126–199) was the first to use experiments to probe the body's functions.[41][42] The term physiology was introduced by the French physician Jean Fernel (1497–1558).[43] In the 17th century, William Harvey (1578–1657) described the circulatory system, pioneering the combination of close observation with careful experiment.[44] In the 19th century, physiological knowledge began to accumulate at a rapid rate with the cell theory of Matthias Schleiden and Theodor Schwann in 1838, that organisms are made up of cells.[43] Claude Bernard (1813–1878) created the concept of the milieu interieur (internal environment), which Walter Cannon (1871–1945) later said was regulated to a steady state in homeostasis.[40] In the 20th century, the physiologists Knut Schmidt-Nielsen and George Bartholomew extended their studies to comparative physiology and ecophysiology.[45] Most recently, evolutionary physiology has become a distinct subdiscipline.[46]

See also

References

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Books

  • Ganong's Review of Medical Physiology. 2016. ISBN 978-0-07-182510-8.
  • Gray's anatomy: the anatomical basis of clinical practice. Editor-in-chief, Susan Standring (40th ed.). London: Churchill Livingstone. 2008. ISBN 978-0-8089-2371-8.

External links

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