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MCAT Question A Day - 6/18/14 - Answer!

Which of the following occurs as a result of parasympathetic stimulation?

A.  Vasodilation of the arteries leading to the kidneys
B.  Increased rate of heart contraction.
C.  Piloerection of the hair cells of the skin.
D.  Contraction of the abdominal muscles during exercise.

A is correct. Parasympathetic stimulation results in "rest and digest" responses, or responses that are not involved in immediate survival or stress. B is a sympathetic response, as is C. 0 is mediated by skeletal muscles, which do not receive autonomic innervation.