Which node is considered the primary pacemaker of the heart?

Which node is considered the primary

Multiple choice — select the best answer

AAtrioventricular (AV) node
BBundle of His
CPurkinje fibers
DSinoatrial (SA) node

✓ Correct answer: D. Sinoatrial (SA) node The sinoatrial (SA) node, located in the right atrium, spontaneously generates the electrical impulse that initiates each heartbeat at 60–100 beats per minute. If it fails, the AV node takes over at a slower rate.

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Topic: Body Systems

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Which node is considered the primary pacemaker of the heart?

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