Multiple Choice
In the electrical conduction system of the heart, the primary pacemaker is the:
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18. The Heart
Electrical Conduction System of the Heart
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Which structure is the normal pacemaker of the heart, initiating the electrical impulse that sets the rhythm under normal conditions?
A
Purkinje fibers
B
Bundle of His (AV bundle)
C
Atrioventricular (AV) node
D
Sinoatrial (SA) node
Verified step by step guidance1
Understand that the heart's rhythm is controlled by specialized structures that generate and conduct electrical impulses.
Identify the main components involved in the heart's electrical conduction system: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His, and Purkinje fibers.
Recognize that the normal pacemaker is the structure that initiates the electrical impulse first, setting the pace for the heart rate under normal conditions.
Recall that the Sinoatrial (SA) node, located in the right atrium, is responsible for generating the initial electrical impulse, making it the heart's natural pacemaker.
Understand that the other structures (AV node, Bundle of His, Purkinje fibers) serve to conduct and coordinate the impulse but do not normally initiate it.
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