Sacs from which hair grows, housing sebaceous glands.

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Multiple Choice

Sacs from which hair grows, housing sebaceous glands.

Hair growth occurs from hair follicles, which are sacs in the skin where the hair root resides. These follicles house the sebaceous glands that secrete sebum into the follicle to lubricate the hair and skin. The dermal papilla sits at the base of the follicle providing nutrients, but it is not the sac from which hair grows. Nerve endings are for sensation and blood vessels supply nutrients, not the growth site. So the structure that fits “Sacs from which hair grows, housing sebaceous glands” is the hair follicle.

Hair growth occurs from hair follicles, which are sacs in the skin where the hair root resides. These follicles house the sebaceous glands that secrete sebum into the follicle to lubricate the hair and skin. The dermal papilla sits at the base of the follicle providing nutrients, but it is not the sac from which hair grows. Nerve endings are for sensation and blood vessels supply nutrients, not the growth site. So the structure that fits “Sacs from which hair grows, housing sebaceous glands” is the hair follicle.

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