What effect does the parasympathetic nervous system have on the heart?
a. Increases cardiac output
b. Decreases heart rate
c. Increases strength of contraction
d. Decreases resting phase
ANS: B
Parasympathetic impulses—along the vagus nerve to the sinoatrial (SA) node, atrioventricular (AV) node, and atrial myocardium—decrease heart rate.
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