Multiple Choice
Which of the following is true concerning the heart's conduction system?
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18. The Heart
Electrical Conduction System of the Heart
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In the electrical conduction system of the heart, the primary pacemaker is the:
A
Purkinje fibers
B
Bundle of His (AV bundle)
C
Atrioventricular (AV) node
D
Sinoatrial (SA) node
Verified step by step guidance1
Understand the role of the heart's electrical conduction system, which controls the heartbeat by generating and transmitting electrical impulses.
Identify the primary pacemaker of the heart, which is the structure that initiates the electrical impulse causing the heart to contract.
Recall that the Sinoatrial (SA) node is located in the right atrium and is responsible for setting the pace of the heartbeat by spontaneously generating electrical impulses.
Recognize that other components like the Atrioventricular (AV) node, Bundle of His, and Purkinje fibers serve to conduct and coordinate the impulse but do not initiate it.
Conclude that the Sinoatrial (SA) node is the primary pacemaker because it starts the electrical signal that triggers the heartbeat.
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