Which of these is referred to as the pacemaker of the heart?
a. Atrioventricular node
b. Bundle of His
c. Purkinje's fibers
d. Sinoatrial node
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ANS: D
The sinoatrial (SA) node is a specialized mass of cardiac muscle that depolarizes rhythmically and most rapidly, about 100 times per minute, and therefore initiates each heartbeat. For this reason, the SA node is sometimes called the pacemaker of the heart.
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