INTEGUMENTARY SYSTEM The skin and its derivatives (sweat & oil glands, hair & nails) make up a very complex set of organs that serves a number of functions, mostly protective. Together these components make up the integumentary system (covering). The skin covers the entire body, has a surface area of 1.5-2.0 square meters, and weighs about 4 kg in the average adult. It is estimated that every square centimeter of the skin contains: 70 cm of blood vessels, 55 cm of nerves, 100 sweat glands, 15 oil glands, 230 sensory receptors, 1/2 million cells. The skin is composed of two distinct regions, the epidermis and the dermis. These two areas are firmly attached to one another along a wavy borderline. The epidermis (epi = upon) composed of epithelial cells, and is the outermost protective shield of the body. The underlying dermis, making up the bulk of the skin, is a tough leathery layer composed of connective tissue proper. Only the dermis is vascularized; nutrients reach the epidermis by diffusing through the tissue.
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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.