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- and the epidermis to the outside. Each
- hair follicle has a small muscle running
- diagonally up from the root through the
- dermis. When the muscle contracts due
- to nervous stimulation, it pulls the hair
- erect. One or more sebaceous glands
- empty oil into each hair follicle. From
- the follicle, the oil spreads in a thin layer
- to cover the outside surface of the skin.
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