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MCAT Question A Day - 6/13/13 - Answer!

During “normal activities,” signals along parasympathetic motor neurons reach the SA node to help coordinate the contractions of the heart. Where do these signals originate?

A.  Cerebrum
B.  Medulla
C.  Cerebellum
D.  Diencephalon

The correct answer is (B). The cardiac center is in the medulla oblongata of the brain stem.