Human hair is erectile due to action of
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unstraited pili muscles
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striated pili muscles
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Both (1) and (2)
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None of these
A
Correct answer
Explanation
Human hair erection (goosebumps) is caused by arrector pili muscles, which are smooth (unstriated) muscles attached to hair follicles. When they contract, hair stands up. Striated muscles are voluntary muscles like skeletal muscles, not involved in this reflex.