Multiple Choice
Which of the following is the correct sequence of components in the heart's electrical 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 normal pacemaker of the heart is the:
A
Purkinje fibers
B
Atrioventricular (AV) node
C
Sinoatrial (SA) node
D
Bundle of His (AV bundle)
Verified step by step guidance1
Understand that the heart's electrical conduction system controls the heartbeat by generating and transmitting electrical impulses.
Identify the main components of the conduction system: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His (AV bundle), and Purkinje fibers.
Recognize that the normal pacemaker of the heart is the structure that initiates the electrical impulse that triggers each heartbeat.
Recall that the SA node, located in the right atrium, spontaneously generates impulses at the fastest rate, setting the pace for the heart.
Conclude that because the SA node initiates the heartbeat and controls the heart rate under normal conditions, it is considered the heart's normal pacemaker.
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