Like their relatives, hair and nails, it reflects both physical and mental health. The skin can warn of internal diseases with changes in its color or texture, with the appearance of pimples or spots. It provides the sense of touch, it can be rough or delicate, soft or wrinkled, as dictated by needs or age.
It can bristle, blister, tingle, itch, hurt, sweat, stretch, shrink, bleed and blush. The skin contributes to the production of vitamin D, vital for the health of bones and joints. Control body temperature. It can show emotions, is a source of social and sexual attraction and denotes racial origin. "The skin of an average adult covers almost two square meters and weighs more than two and a half kilos"
What is the skin?
Some of the skin data is impressive: each hand has 17,000 touch receptors and 200 nerve endings per square centimeter. The skin of an average adult covers almost two square meters, weighs just over two and a half kilos and sheds about nineteen kilos of dead cells throughout life.
The skin has a complex structure formed by two different layers: the epidermis and, under it, the dermis.
The epidermis is variable in thickness, from one millimeter in the palms of the hands and soles of the feet, where the protection against pressure is the most important, to a tenth of a millimeter in the face, eyelids and lips, where precision is needed and speed in movements.
The epidermis does not contain red blood cells, but produces melanin, which darkens the skin to protect it from the sun. The pinkish color of people with white skin is influenced by the red color of blood cells and carotene, which filters sunlight.
In the deepest part of the epidermis, the young cells, which are oval, soft and soft, divide constantly and surface approximately every twenty-eight days.
They change as they rise through the germination zone and are filled with keratin (a fibrous substance that is also found in the hair and nails), flattened and joined together closely to form the two protective sections of the epidermis: the bright membrane interior and surface with its millions of hairs and sweat glands.
Subject to constant wear, these cells peel, but are constantly replaced. New cells provide essential water to maintain skin flexibility.
Under the epidermis is the dermis, a fibrous layer, thicker in men than in women, more enough in the back and variable in thickness (between half a millimeter and three). It is full of collagen, which with its elastic fibers gives the skin strength and elasticity.
The dermis feeds the production of keratin, extracts waste and regulates body temperature. Several thousand nerve endings play an essential role in the sense of touch by perceiving cold, heat, pressure and pain.
There are also bags of hair follicles, where the sebaceous glands secrete sebum, an oily substance that makes the skin ductile and hair shiny.
Nails are simply compressed keratin. Like the skin, the base of the nail has a germinate zone and a dermis that serves as a base, which provides blood and gives the nail its pinkish hue. Next to its root, the nail is denser and the blood supply reduced, hence the white crescent. The cuticle forms a waterproofing seal.
Hair is the outermost layer of the epidermis, and has several protective functions. The hair of the head insulates, the eyelashes and the hairs of the nose and the ears protect of foreign objects and the eyebrows help to avoid that the sweat arrives at the eyes. "Emotional problems can also cause skin problems"
Of all the organs of the body, the skin is the most versatile of all. It is the only organ that is directly and constantly open to the outside. The skin protects from external agents, heat and cold, air and elements, bacteria, is waterproof, repairs and lubricates itself, even removes some waste from the body.
Like their relatives, hair and nails, it reflects both physical and mental health. The skin can warn of internal diseases with changes in its color or texture, with the appearance of pimples or spots. It provides the sense of touch, it can be rough or delicate, soft or wrinkled, as dictated by needs or age.
It can bristle, blister, tingle, itch, hurt, sweat, stretch, shrink, bleed and blush. The skin contributes to the production of vitamin D, vital for the health of bones and joints. Control body temperature. It can show emotions, is a source of social and sexual attraction and denotes racial origin. "The skin of an average adult covers almost two square meters and weighs more than two and a half kilos"
What is the skin?
Some of the skin data is impressive: each hand has 17,000 touch receptors and 200 nerve endings per square centimeter. The skin of an average adult covers almost two square meters, weighs just over two and a half kilos and sheds about nineteen kilos of dead cells throughout life.
The skin has a complex structure formed by two different layers: the epidermis and, under it, the dermis.
The epidermis is variable in thickness, from one millimeter in the palms of the hands and soles of the feet, where the protection against pressure is the most important, to a tenth of a millimeter in the face, eyelids and lips, where precision is needed and speed in movements.
The epidermis does not contain red blood cells, but produces melanin, which darkens the skin to protect it from the sun. The pinkish color of people with white skin is influenced by the red color of blood cells and carotene, which filters sunlight.
In the deepest part of the epidermis, the young cells, which are oval, soft and soft, divide constantly and surface approximately every twenty-eight days.
They change as they rise through the germination zone and are filled with keratin (a fibrous substance that is also found in the hair and nails), flattened and joined together closely to form the two protective sections of the epidermis: the bright membrane interior and surface with its millions of hairs and sweat glands.
Subject to constant wear, these cells peel, but are constantly replaced. New cells provide essential water to maintain skin flexibility.
Under the epidermis is the dermis, a fibrous layer, thicker in men than in women, more enough in the back and variable in thickness (between half a millimeter and three). It is full of collagen, which with its elastic fibers gives the skin strength and elasticity.
The dermis feeds the production of keratin, extracts waste and regulates body temperature. Several thousand nerve endings play an essential role in the sense of touch by perceiving cold, heat, pressure and pain.
There are also bags of hair follicles, where the sebaceous glands secrete sebum, an oily substance that makes the skin ductile and hair shiny.
Nails are simply compressed keratin. Like the skin, the base of the nail has a germinative zone and a dermis that serves as a base, which provides blood and gives the nail its pinkish hue. Next to its root, the nail is denser and the blood supply reduced, hence the white crescent. The cuticle forms a waterproofing seal.
Hair is the outermost layer of the epidermis, and has several protective functions. The hair of the head insulates, the eyelashes and the hairs of the nose and the ears protect of foreign objects and the eyebrows help to avoid that the sweat arrives at the eyes. "Emotional problems can also cause skin problems"...
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