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Unformatted text preview: Melanin reduces damage that can lead to skin cancer. Layers of skin epidermis – only as thick as 2 sheets of paper. thicker on palms and soles most cells are dead dermis – collagen fibers provide strength contains several small structures such as sweat glands, hair follicles, and nerves and blood vessels. hypodermis – lowest layer connects to muscles Hair and Nails A hair forms at the bottom of a hair follicle. Older cells get pushed up. Hair shaft is dead. Hair gets its color from melanin, like skin. Hair helps protect us from UV light. Hair keeps dust and insects out of eyes and nose. A nail grows from living cells in the nail root. As new cells form, the nail grows longer. Nails protect the tips of your fingers and toes....
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- Fall '10
- Biology, chemical called, sweat glands, largest organ