What is the sac within which each hair grows?

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Multiple Choice

What is the sac within which each hair grows?

Explanation:
Hair grows from a hair follicle, a tiny sac embedded in the skin that surrounds the hair root. The follicle anchors the hair and houses the bulb where the hair is produced by matrix cells, receiving nutrients from surrounding blood vessels to support growth. The part you see sticking out above the skin is the hair shaft, not the sac itself. A pore is just the surface opening, and nerve endings are for sensation, not a growth structure. So the sac that houses each hair is the hair follicle.

Hair grows from a hair follicle, a tiny sac embedded in the skin that surrounds the hair root. The follicle anchors the hair and houses the bulb where the hair is produced by matrix cells, receiving nutrients from surrounding blood vessels to support growth. The part you see sticking out above the skin is the hair shaft, not the sac itself. A pore is just the surface opening, and nerve endings are for sensation, not a growth structure. So the sac that houses each hair is the hair follicle.

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