MCAT Question of the Day
    •

    Q:

    		 Arrector pili muscles are small smooth muscles attached to hair follicles that raise the hairs under conditions of stress or cold. Which of the following statements is true regarding arrector pili muscles?
    		 

    A

    		 Arrector pili muscles are under the control of the somatic nervous system.

    B

    		 Contraction of the arrector pili muscles is stimulated by the sympathetic nervous system.

    C

    		 Arrector pili muscles cells are separated by Z disks.

    D

    		 Arrector pili muscles are under conscious control.



    Nervous System | Skin |
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