MCAT Question of the Day
    •

    Q:

    		 Arrector pili muscles are smooth muscles which associate with the dermal region of hair follicles in mammals. The contraction of these muscles results in hairs to stand on end. This can be especially seen in house cats when they are distressed or scared. Which of the following is false regarding these muscles?
    		 

    A

    		 There is little to no vasculature in the region these muscles are found

    B

    		 Innervation of the muscles is by the sympathetic branch of the autonomic nervous system

    C

    		 These muscles lack striations

    D

    		 Contraction of these muscles is due to increases in intracellular calcium concentration



    Musculoskeletal System | Skin |
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