DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Normal skin. Close-up of an area of normal healthy skin on the wrist of an 8-year-old boy. The skin is the body's outer covering. It protects the body from injury and invasion by microorganisms, it regulates temperature and is an organ of excretion. Skin is also a sense organ being sensitive to heat, cold, touch and pain. Visible here is the outermost layer of the skin's epidermis, a tough horny layer of dead cells which protects living layers beneath. It is pink in colour due to the blood vessels within the skin. Hairs are spaced over the skin surface. They are erected when the skin is cold.
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