Multiple Choice
Which electrical activity of the cardiac conduction system is reflected in the P wave?
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18. The Heart
Electrical Conduction System of the Heart
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What normally serves as the pacemaker of the entire heart?
A
Sinoatrial (SA) node
B
Bundle of His
C
Atrioventricular (AV) node
D
Purkinje fibers
Verified step by step guidance1
Understand the role of the pacemaker in the heart: The pacemaker is responsible for initiating the electrical impulses that set the rhythm for the heart's contractions.
Identify the primary pacemaker of the heart: The Sinoatrial (SA) node is known as the natural pacemaker of the heart because it generates electrical impulses that initiate each heartbeat.
Compare the SA node with other components: The Atrioventricular (AV) node, Bundle of His, and Purkinje fibers are part of the heart's conduction system but do not serve as the primary pacemaker.
Recognize the location and function of the SA node: The SA node is located in the right atrium of the heart and is responsible for setting the pace of the heartbeat by generating regular electrical impulses.
Conclude that the SA node is the correct answer: Based on its role and location, the SA node is the structure that normally serves as the pacemaker of the entire heart.
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