The nurse understands that the primary pacemaker of the heart is the:
a. vagus nerve. c. SA node.
b. bundle of His. d. AV node.
ANS: C
Feedback
A Incorrect: The vagus nerve is not the pacemaker of the heart.
B Incorrect: The bundle of His are fibers that flow throughout the ventricles, but are not the pacemaker.
C Correct: The sinoatrial node is the pacemaker of the heart.
D Incorrect: Although the atrioventricular node does invoke electrical impulses, it is not the primary pacemaker of the heart.
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