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Hair is a protein made of a follicle, root and bulb. The follicle is deep in the skin & is attached to a tiny sebaceous gland and muscle fiber. Hair grows when the follicle gathers a "bundles" old cells. The sebaceous gland and muscle fiber push the bundles of old cells up through the skin in a root sheath. The sheath has an internal and external layer. The external layer contains RNA that gives the hair its color and texture. The internal layer contains the hair fiber.
14 years ago. Rating: 1 | |
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