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Arrector pili muscles are smooth muscles that cause “goosebumps” by pulling hairs in your skin. What causes the arrector pili muscles to contract?

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Correct Answer: B. Autonomic motor neurons
The question directly states that arrector pili muscles are smooth muscles, and are therefore involuntary and under the control of autonomic motor neurons. Smooth muscles include muscles in your circulatory system and intestines that cause peristalsis.
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