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bagirrra123 [75]
3 years ago
13

Under what conditions is the arrector pili muscle stimulated? What part of the brain would produce an efferent signal to this sm

ooth muscle effector?
Medicine
1 answer:
Snowcat [4.5K]3 years ago
3 0

Answer:

The pili arrector muscle, or erector muscle of the hair, is a muscle composed of smooth muscle fibers which is innervated by the sympathetic nervous system (SNS). When the hair is erect, what is known as "goosebumps" is produced; This action is involuntary and can be caused by fear, cold, among others. The efferent signals to activate this muscle come from the hypothalamus, brain stem and spinal cord.

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