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MCAT Question A Day - 8/5/14 - Answer!

The atrioventricular node:

A.  is a parasympathetic ganglion located in the right atrium of the heart.
B.  conducts an action potential from the vagus nerve to the heart.
C.  sets the rhythm of cardiac contractions.
D.  delays the contraction of the ventricles of the heart.

D is correct. The atrioventricular node, which sits at the junction between the atria and the ventriclespauses for a fraction of a second before passing an impulse to the ventricles.

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