Skin is our largest organ—adults carry 3.8kg / 2m2
Skin acts as a waterproof, insulating shield, guarding the body against extremes of temperature, damaging sunlight, and harmful chemicals. It also exudes antibacterial substances that prevent infection and manufactures vitamin D for converting calcium into healthy bones. Skin is a huge sensor packed with nerves for keeping the brain in touch with the outside World -an amazingly versatile organ.
Skin consists of three layers. The outermost is the epidermis. This consists mainly of cells called keratinocytes, made from keratin (also the material in hair and nails). Keratinocytes form several layers that constantly grow outwards as the exterior cells die and flake off. It takes roughly four to five weeks for newly created cells to work their way to the surface. This covering of dead skin is known as the stratum corneum and its thickness varies considerably, being more than ten times thicker on the soles of the feet than around the eyes. The epidermis harbors defensive Langerhans cells, which alert the body's immune system to viruses and other infections.
The epidermis is bonded to a deeper skin layer below known as the dermis, which gives the organ its strength and elasticity thanks to fibers of collagen and elastin. Blood vessels here help regulate body temperature by increasing blood flow to the skin to allow heat to escape, or by restricting the flow when it's cold. A network of nerve fibers and receptors pick up feelings such as touch, temperature, and pain.
The dermis houses hair follicles and glands with ducts that pass up through the skin. Sweat glands bring down internal temperature through perspiration while ridding the body of the waste fluids urea and lactate. Apocrine glands, which develop during puberty, produce a scented sweat linked to sexual attraction that can also cause body odor, especially around the armpits. Sebaceous glands secrete oil-like sebum for lubricating the hair and skin.
The skin's base layer is the subcutis, which includes a seam of fat laid down as a fuel reserve in case of food shortage. It also works as insulation and cushions us from impacts.
Skin is coloured by melanin, a pigment produced in the epidermis. it protects us from the sun's potentially cancer-causing ultraviolet (UV) rays. Dark-skinned people produce more numerous and deeper coloured melanin particles.
Fair skin is an adaptation found in people from northern latitudes where solar rays are relatively weak. Here the benefits of dark skin are outweighed by the need for bone-strengthening vitamin D, produced through exposure to UV rays. Warmer, sunnier environments bring the risk of serious skin damage. Australia, where the majority of the population is of northern European descent, has the world's highest rates of skin cancer, accounting for more than 80 percent of all cancers diagnosed there each year.
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