Final answer:
The three regions of a human hair are the bulb, root, and shaft.
Step-by-step explanation:
The Three Regions of a Human Hair
The three regions of a human hair are the bulb, root, and shaft. The bulb is the enlarged base of the hair follicle that contains the hair matrix, which is responsible for hair growth. The root is the portion of the hair that is embedded within the follicle, and it extends from the bulb to the surface of the scalp. The shaft is the visible part of the hair that extends from the surface of the scalp to the hair tip.
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