What Is The Function Of Skin Tissue

What Is The Function Of Skin Tissue – Human skin is the outer covering of the body and is the largest organ of the intestinal system. The skin has up to 5 layers of ectodermal tissue that protect muscles, bones, ligaments and internal organs. Human skin is similar to the skin of other mammals, and it is very similar to the skin of a pig. Although almost all of the human skin is covered with hair, it can appear hairless. There are two general types of skin: hairy and glabrous (hairless). The adjective skin literally means “of the skin” (Latin cutis, skin).

The skin plays an important immune role, protecting the body from pathogens and excessive water loss. Its other functions are insulation, temperature regulation, condensation, synthesis of vitamin D, and protection of the B vitamin folate. Severely damaged skin will try to heal itself by forming scar tissue. This often fades and discolours.

What Is The Function Of Skin Tissue

What Is The Function Of Skin Tissue

In humans, skin pigmentation (influenced by melanin) varies between populations, and skin types can range from dry to non-dry and oily to non-oily. Such diversity as the skin provides a rich and diverse environment for bacteria, which number approximately 1,000 species from the 19 phyla that reside on human skin.

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The skin has mesodermal cells, pigmentation, such as melanin, which provides melanocytes that absorb the highly dangerous ultraviolet radiation (UVB) from sunlight. It also contains DNA-repairing zymes that help reverse UV damage, so people who lack the fat needed for these zymes have higher rates of skin cancer. One form that is primarily caused by UV light, malignant melanoma, is particularly invasive, causing it to spread rapidly and can often be fatal. Human skin pigmentation varies strikingly among populations. This led to the classification of people according to skin color.

In terms of surface area, the skin is the second largest organ of the human body (the inside of the small intestine is 15-20 times larger). For the average adult, the surface area of ​​the skin is 1.5–2.0 square meters (16–22 square feet). The thickness of the skin varies considerably in all parts of the body, and between mother and mother, young and old. For example, the foreskin, which averages 1.3 mm in males and 1.26 mm in females.

The skin contains 650 sweat glands, 20 blood vessels, 60,000 melanocytes and more than 1,000 nerve cells.

The average human skin cell is about 30 micrometers (μm) in diameter, but there are variations. A skin cell usually ranges from 25 to 40 µm

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The epidermis, from the Greek “epi” meaning “above” or “above,” is the outermost layer of the skin. It forms an impermeable, protective membrane over the body surface that also serves as a barrier to infection and is composed of stratified squamous epithelium with an underlying basal lamina.

The epidermis contains no blood vessels, and the cells of the deepest layers are nourished almost exclusively by the oxygen diffused from the surrounding air.

And to a much lesser extent through blood capillaries that extend to the outer layers of the dermis. The main cell type that makes up the epidermis is Merkel cells, keratinocytes, melanocytes and Langerhans cells are also precursors. The epidermis can be further divided into the following layers (starting from the outermost layer): Cells are formed in the basal layer by mitosis. Daughter cells (see Cell division) move through the layer, changing shape and composition as they die due to isolation from the blood source. The cytoplasm is released and keratin protein is deposited. They eventually reach the cornea and fall off (desquamation). This process is called “keratinization”. This keratinized layer of skin is responsible for retaining water in the body and other harmful chemicals and pathogens, making the skin a natural barrier to infection.

What Is The Function Of Skin Tissue

2D projection of a 3D OCT-tomography of the skin on a fingertip depicting the corneal layer (~500 μm thick) with the disjunctum layer above and the luminal layer in the middle. Below are the superficial parts of the dermis. Sweat ducts are clearly visible. (See also: Rotating 3D Version)

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The epidermis contains no blood vessels and is nourished by diffusion from the dermis. The main types of cells that make up the epidermis are keratinocytes, melanocytes, Langerhans cells and Merkel cells. The epidermis helps the skin regulate body temperature.

The skin has up to 5 layers of ectodermal tissue and protects the underlying muscles, bones, ligaments and internal organs.

The epidermis is divided into several layers, where cells are formed by mitosis in the innermost layers. They move in layers, changing shape and composition as they differentiate and fill with keratin. Once they reach the upper stratum corneum, they eventually “slough off” or peel off. This process is called keratinization and takes place over weeks.

In the past, the cornea was thought to be “a simple, biologically inactive, outer epidermal layer consisting of a fibrillar network of dead keratin.”

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It is now understood that this is not true and that the stratum corneum should be considered living tissue.

While it is true that the stratum corneum is composed primarily of terminally differentiated keratinocytes, called stratum corneum, which are nucleated, these cells remain alive and metabolically viable until desquamation.

Blood capillaries are found beneath the epidermis and are associated with the arterioles and vula. Arterial shunt vessels can bypass the mesh in the ears, nose, and fingertips.

What Is The Function Of Skin Tissue

Almost 500g has a high pattern of skin expression. There are less than 100 fats that are specific to the skin, and they are expressed in the epidermis.

Anatomical Structure And Function Of Skin Medical Illustration Stock Illustration

Analysis of the corresponding proteins shows that they are mainly expressed in keratinocytes and have functions related to membrane differentiation and keratinization.

The dermis is the layer of skin that covers the epidermis, which consists of connective tissue and protects the body from stress and strain. The dermis is closely connected to the epidermis by the basement membrane. It also contains many nerve impulses that provide the sensation of touch and heat. It contains hair follicles, sweat glands, sebaceous glands, apocrine glands, lymph vessels, and blood vessels. Blood vessels in the skin provide nutrition and removal of waste from its own cells as well as from the basal layer of the epidermis.

The structure of the skin is divided into two areas: a superficial area adjacent to the epidermis called the papillary region and a deeper thicker area known as the retina.

The papillary region is composed of loose areolar connective tissue. It is named for its finger-like projections called papillae that extend into the epidermis. The papillae provide the dermis with a “bumpy” surface that fuses with the epidermis, cementing the bond between the two layers of skin.

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In the palms, fingers, soles, and toes, the impact of scattered papillae in the epidermis forms contours on the skin surface. These epidermal ridges occur in patterns (see fingerprint) that are morphologically and epigenetically determined and thus unique to the individual, enabling the use of fingerprints or footprints as a means of identification.

The reticular region is located in the papillary region and is usually much thicker. It is composed of dse irregular connective tissue and derives its name from the dse condensation of collagenous, elastic, and reticular fibers that weave over it. These protein fibers give the dermis its properties of strength, elasticity and elasticity.

Hair roots, sebaceous glands, sweat glands, receptors, nails and blood vessels are also located in the reticular area.

What Is The Function Of Skin Tissue

Tattoo ink is stored in the dermis. Stretch marks, often caused by pregnancy and obesity, are also located in the dermis.

Anatomy And Function Of The Dermis

The subcutaneous tissue (also called the hypodermis and subcutaneous tissue) is not part of the skin, but lies beneath the dermis. Its purpose is to attach the skin to the underlying bones and muscles, and to supply it with blood vessels and nerves. It consists of loose connective tissue, adipose tissue and elastin. The main cell types are fibroblasts, macrophages, and adipocytes (subcutaneous tissue contains 50% of body fat). Fat serves as padding and insulation for the body.

Human skin exhibits a high variation in skin color, from the darkest brown to the lightest pinkish-white tones. Human skin has greater variation in color than any other single mammalian species and is the result of natural selection. Skin pigmentation in humans evolved primarily to regulate the amount of ultraviolet radiation (UVR) that penetrates the skin, controlling its biochemical effects.

Many factors affect the actual skin color of different people, although the single most important factor in determining a person’s skin color is melanin. Melanin is produced within the skin in cells called melanocytes, and is the main determinant of skin color in people with darker skin. The skin color of fair-skinned people is determined primarily by the bluish-white connective tissue beneath the dermis and the hemoglobin circulating in the veins of the dermis. The underlying red color of the skin becomes more visible, especially in the face, as a result of exercise or stimulation of the nervous system.

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