Epidermis: Made of epithelial cells, over skin, Made up of epithelial cells (10-30 cells thick), dead cells constantly shed = some of the dust in house, OUTER LAYERS contain a protein called as keratin which waterproofs and protect the tissue underneath., INNER LAYERS of cells contain a pigment known as melanin which absorbs light energy which protects the deeper cells from the damaging effect of ultraviolet rays of sunlight., contains cells which are continually dividing by mitosis to replace cells that are lost or die., Dermis: Second layer of skin just beneath epidermis, Usually 15-40 times thicker than epidermis, It contains nerve cells, muscle cells, sweat glands, oil glands and hair follicle, has Connective tissue, that prevents the skin from tearing and enables the skin to return to its normal state after being stretched., hair cells grow out of narrow cavities in the dermis called hair follicles., cells at the base of hair follicle divide and push away from the follicle, causing hair to grow., have sebaceous gland that produce oil that lubricate the skin and hair, Subcutaneous Layer: Inner layer of skin beneath dermis, Made up of connective tissue which store fat and helps the body retain heat,

Three Layers of Skin

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