Skin
Skin
The Skin has been described as the largest organ in the body. It helps to regulate temperature though narrowing and widening of the blood vessels in the dermis. Skin is composed of two layers the epidermis and dermis.
*Epidermis- this is the thinner of the two layers of the skin and serves as a tough protective cover for the underlying dermis .It is made up of numerous layers of cells the innermost of which consist of living cube-shaped cells that divide rapidly, providing cells for the outer layers. By the time these cell reach the outer layers, they have died and become flattened, before being sloughed off by abrasion. The epidermis has no blood supply of its own, and depends upon diffusion of nutrients from the plentiful supply of blood to the dermis below
*Dermis-this is the thicker layer of the skin, which lies protected under the epidermis it is composed of connective tissue which has elastic fibres to keep it stretchy, and collagen fibres for strength. The dermis contains a rich supply of blood vessels as well as numerous sensory nerve endings. Lying within this layer are the other important structures of the integumentary system, including hair follicles and oil (sebaceous) and sweat glands.
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