Notes Mar 25th- exam 3

Notes Mar 25th- exam 3 - Epidermis- outer most layer...

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Epidermis- outer most layer consisting of layers of cells stacked in a tile like fashion. Provide primary line of defense from infection and water loss. Composed of protein- KERATIN consists of epidermal cells, hair, hair follicles and oil glands Epidermis- thickness of paper Dermis- Underlying layer of skin which contains blood vessels, nerves, sensors, sweat glands, and elastic fibers which bind the skin to the underlying body tissues Functions of Skin 1. Primary Line of Defense- from Infection 2. Retain Water and Moisture 3. Sweat Glands- 2 ½ million in our body Sweat contains salts, lysozymes to destroy bacteria, fungi and viruses 4. Radiator- removes excess heat from the skin 5. Sensory- touch, pressure, pain, heat, cold (all nerves) 6. Pigmentation- pigmented by melanin (protective pigment, different shades) 7. Vitamin D- sunshine vitamin, helps prevent heart attacks 8. Renewal- one of the fastest growing tissues in the body 9. Lubrication 10. Hair and Nails Problems with Skin 1. Acne- clogged oil glands, Bacteria grow
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This note was uploaded on 08/15/2011 for the course BIO 1005 taught by Professor Limcomb during the Spring '08 term at Virginia Tech.

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Notes Mar 25th- exam 3 - Epidermis- outer most layer...

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