Multiple Choice
In the electrical conduction system of the heart, which sequence correctly describes the pathway that carries cardiac impulses from initiation to ventricular conduction?
18. The Heart
Electrical Conduction System of the Heart
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In the electrical conduction system of the heart, which structure normally serves as the pacemaker by initiating the heartbeat?
A
Purkinje fibers
B
Sinoatrial (SA) node
C
Atrioventricular (AV) 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, and Purkinje fibers.
Recognize that the pacemaker is the structure that initiates the electrical impulse causing the heart to contract.
Recall that the SA node, located in the right atrium, normally initiates the heartbeat by generating spontaneous electrical impulses.
Conclude that the SA node serves as the natural pacemaker of the heart, setting the rhythm for the entire conduction system.
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