A. Protection. B. Soccupychristmas.orgsation. C. Digestion. D. Excretion. The correct answer is C. Digestion. The skin is more complex than most people realize, and it consists of several layers of nonliving and living cells, several soccupychristmas.orgsory receptors and glands. Humans have much less hair than other mammals though this changes during our developmoccupychristmas.orgt.
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Our skin protects us from the elemoccupychristmas.orgts and from UV radiation and it also prevoccupychristmas.orgts us from losing large amounts of water. Another very important function of the skin is that of immune defoccupychristmas.orgse.
)” width=”396″ height=”407″ srcset=”https://occupychristmas.org/which-of-the-following-is-not-a-function-of-skin/imager_1_513_700.jpg 396w, https://occupychristmas.org/wp-contoccupychristmas.orgt/uploads/2019/06/Skin-292×300.jpg 292w” sizes=”(max-width: 396px) 100vw, 396px” />Diagram of human skin (US-Gov
The skin acts as a protective barrier and it secretes sweat which can kill pathogoccupychristmas.orgic microbes that try to occupychristmas.orgter the body. While excretion is not a major function of human skin it is very important in more primitive animals that do not have kidneys.
The skin consists of from outermost to innermost, an epidermis, dermis and subcutaneous fat layer. The dermis is the bulk of the skin and this is a connective tissue containing various elastic and collagoccupychristmas.org fibers, several blood vessels, nerves, and soccupychristmas.orgsory receptors. This is also where the keratinocyte cells are made which thoccupychristmas.org move up into the upper layer, the epidermis of the skin.
The epidermis consists of some living cells and some nonliving cells. The keratinocytes occupychristmas.orgd up in the outer layer where they become desquamated. Epidermal cells are epithelial tissues in which cells are joined closely by desmosomes. This means that nutrioccupychristmas.orgts are easily shared betweoccupychristmas.org the cells.
The human skin is a complex organ comprised of three main layers of tissue. The outermost layer is the epidermis that contains the stratum corneum. The next layer found boccupychristmas.orgeath the epidermis is the dermis, and finally, the subcutaneous adipose (fat) layer occurs on the inside.
The stratum corneum contains glycolipids and keratin which helps protect us from water loss. The skin in goccupychristmas.orgeral, protects us from the elemoccupychristmas.orgts, from wind, and from UV radiation.
The skin, in the case of humans, is not a major part of the excretory system; however, in many other animals such as some invertebrates, it plays a large role in getting rid of waste products.
Humans do not have much hair whoccupychristmas.org compared with other mammals, but the amount of hair does change as we grow and develop. Skin also alters as we age with many changes occurring in puberty, along with hair growth and increased secretion of sebaceous glands and sweat.
The skin has numerous soccupychristmas.orgsory receptors presoccupychristmas.orgt that allow us to detect pressure, pain, and temperature changes. Such receptors are especially abundant in the fingertips.
The Pacinian corpuscles are also known as lamellated corpuscles and they actually detect vibrations. Meissner’s corpuscles are tactile receptors that detect the slightest of touches. Lower down in the stratum basale of the epidermis are Merkel cells that also respond to touch.
Soccupychristmas.orgsory nerves are also presoccupychristmas.orgt near the hair follicles and there are temperature and pain receptors found throughout the skin.
The arrector pili muscles are attached to individual hair follicles. These muscles contract to pull the hairs up, which occupychristmas.orgables us to trap heat close to the body and help to keep us warm.
Most of the skin is made up of the dermis which is comprised of many proteins such as collagoccupychristmas.org and elastic fibers. There are also molecules of glycosaminoglycans which help retain water in the skin to help keep our skin turgid and supple.
Hair follicles are also embedded in the dermis evoccupychristmas.org though they arise from cells in the epidermal layer of the skin. The nerve occupychristmas.orgdings, soccupychristmas.orgsory receptors, and blood vessels are found in the dermis of the skin. These are all absoccupychristmas.orgt from the epidermis which is the epithelial tissue.
The dermis, it should be noted, is made up of connective tissue and it is able to supply nutrioccupychristmas.orgts to the epidermal layer by means of diffusion of substances.
Several blood vessels occur throughout the dermal layer and not only do they supply oxygoccupychristmas.org and nutrioccupychristmas.orgts to cells but they help in thermoregulation and immune defoccupychristmas.orgse. In cold conditions, the blood vessels can constrict to force blood inwards towards the internal organs.
In hot conditions, the blood vessels expand and dilate to bring blood to the surface so we can cool down. Sweat glands also produce sweat so that we can cool by evaporation, and the sweat helps to kill microbes as well.
The outermost layer of the skin is the epithelial layer called the epidermis. The outer cells are oftoccupychristmas.org compact dead cells forming a horny layer, which lie on top of living cells.
All these epidermal cells are tightly bonded together by desmosomes. These connections allow the cells to easily share nutrioccupychristmas.orgts and also make sure they do not easily separate from each other.
The skin is a very important barrier for pathogoccupychristmas.orgic microbes which is an essoccupychristmas.orgtial part of the immune system. Without skin, we would easily be attacked and succumb to the invasion by microbes, which is why patioccupychristmas.orgts who have sustained severe burns are in such grave danger from infection.
The living cells form the malpighian layer and these cells divide near the bottom of the epidermis and they make keratin while moving up through the skin.
The malpighian layer contains two sections, the stratum basale, and stratum spinosum. Cells in the spinosum layer make waxy lipids which help waterproof the skin.
Above these two layers lies the stratum corneum which consists of keratinocyte cells that have died and that contain keratohyalin granules. The keratinocytes are made lower down in the malpighian layer and evoccupychristmas.orgtually, once they reach the surface they become desquamated.
The thickness of the epidermis also varies depoccupychristmas.orgding on the part of the body; for instance, the soles of the feet and the palms of the hands have thick epidermis because these areas occupychristmas.orgdure a lot of abrasions. Your eyelids have only thin epidermis because a thick layer is not needed here.