INTEGUMENTERY SYSTEM
DERMIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Goosebumps are caused by contractions of the ____ muscle
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Arrector pili
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Apocrine
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Eccrine
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Sebaceous
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Explanation:
Detailed explanation-1: -Goosebumps occur when tiny muscles in our skin’s hair follicles, called arrector pili muscles, pull hair upright. For animals with thick fur, this response helps keep them warm.
Detailed explanation-2: -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.
Detailed explanation-3: -Each arrector pili is composed of a bundle of smooth muscle fibres, which attach to several follicles (a follicular unit) and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is, therefore, involuntary .
There is 1 question to complete.