Which structure is the sac within which each hair grows?

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Multiple Choice

Which structure is the sac within which each hair grows?

Explanation:
Hair grows from a specialized pocket in the skin called a hair follicle. This follicle is a sac-like structure that surrounds the hair root as it forms, providing the environment and nutrients for cell division in the hair matrix at the base. The part you see above the skin is the hair shaft, which extends from the follicle but is not the sac itself. The dermis is the skin layer that houses the follicle, glands, and vessels, while nerve endings are separate sensory structures. So the sac that encloses the growing hair is the hair follicle.

Hair grows from a specialized pocket in the skin called a hair follicle. This follicle is a sac-like structure that surrounds the hair root as it forms, providing the environment and nutrients for cell division in the hair matrix at the base. The part you see above the skin is the hair shaft, which extends from the follicle but is not the sac itself. The dermis is the skin layer that houses the follicle, glands, and vessels, while nerve endings are separate sensory structures. So the sac that encloses the growing hair is the hair follicle.

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