Wisconsin Barber Practice Exam

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Which part of the hair follicle is responsible for hair growth?

Hair bulb

The hair bulb is the part of the hair follicle responsible for hair growth. It is located at the base of the hair follicle and contains actively dividing cells, known as matrix cells. These cells multiply and produce keratin, the protein that makes up the hair shaft. As new cells are generated, they push older cells upward, leading to hair lengthening.

The hair root, while involved in anchoring the hair in the follicle, does not itself generate new hair; instead, it is the point where the bulb actively contributes to growth. The hair shaft is the visible part of the hair that extends beyond the skin's surface and is composed of dead keratinized cells that have already been formed in the hair bulb. Lastly, the hair shaft base refers generically to the bottom part of the hair shaft close to the follicle, but the specific growth processes occur at the bulb where cellular activity is highest.

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Hair shaft

Hair root

Hair shaft base

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