Multiple Choice
Which structure is considered the primary pacemaker of the heart under normal physiological conditions?
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18. The Heart
Electrical Conduction System of the Heart
Multiple Choice
In the electrical conduction system of the heart, which structure is considered the pacemaker of the heart?
A
Atrioventricular (AV) node
B
Bundle of His (AV bundle)
C
Purkinje fibers
D
Sinoatrial (SA) node
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 this system: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His, and Purkinje fibers.
Recognize that the pacemaker of the heart is the structure that initiates the electrical impulse, setting the rhythm for the heart rate.
Recall that the SA node, located in the right atrium, is responsible for generating the initial electrical impulse, making it the natural pacemaker.
Note that the AV node, Bundle of His, and Purkinje fibers serve to conduct and distribute the impulse but do not initiate it.
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