The nurse suspects that a patient's heart rate is being affected by parasympathetic influence. What should the nurse recall as the effect the parasympathetic nervous system has on the heart?
a. Decreases heart rate
b. Decreases resting phase
c. Increases cardiac output
d. Increases strength of contraction
ANS: A
Parasympathetic impulses—along the vagus nerve to the sinoatrial (SA) node, atrioventricular (AV) node, and atrial myocardium—decrease heart rate. B. The parasympathetic nervous system does not influence the resting phase. C. D. The parasympathetic nervous system does not increase cardiac output or the strength of contractions.
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