The normal pacemaker of the heart is the
a. S-A node at 120 bpm. c. S-A node at 70 bpm.
b. A-V node at 60 bpm. d. A-V node at 40 bpm.
C
The sinoatrial (S-A) node is the normal pacemaker of the heart and is located below the right atrial epicardium at its junction with the superior vena cava. The impulse it initiates is approximately 70 times per minute and is sent to the atrioventricular (A-V) node. Then, the impulse travels to the bundle of His, the right and left bundle branches, and then through the ventricles.
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How should the nurse respond to a parent who asks, "How can I protect my baby from whooping cough?"
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