INTEGUMENTERY SYSTEM
DERMIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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apocrine sweat glands
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hair follicles
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sebaceous glands
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contraction of arrector pili muscles
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Detailed explanation-1: -The arrector pili muscles, also known as hair erector muscles, are small muscles attached to hair follicles in mammals. Contraction of these muscles causes the hairs to stand on end, known colloquially as goose bumps (piloerection).
Detailed explanation-2: -The arrector pili muscle (APM) consists of a small band of smooth muscle that connects the hair follicle to the connective tissue of the basement membrane. The APM mediates thermoregulation by contracting to increase air-trapping, but was thought to be vestigial in humans.
Detailed explanation-3: -The arrector pili muscle is a smooth muscle that attaches to the hair follicle, on one side, and the dermis, on the other. Contraction of the arrector pili muscle causes the hair follicle to stand on end, creating goose bumps.