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Hair Growth |
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| A hair grows upward from the root. Lengthening fibers of keratin-filled dead cells, grouped around the semihollow medulla, make up the cortex. A living structure called the bulb (visible as a white lump at the end of a plucked hair) surrounds and feeds the root, which lies in a pocket of the epidermis called the follicle. Hair grows fastest when it is short. | ||||||
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| Skin; Hair | ||||||
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