Multiple Choice
Autorhythmicity in the heart (the ability to spontaneously generate electrical impulses) is primarily the responsibility of which structure?
18. The Heart
Electrical Conduction System of the Heart
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In the electrical conduction system of the heart, which structure is known as the pacemaker of the heart?
A
Bundle of His (AV bundle)
B
Purkinje fibers
C
Sinoatrial (SA) node
D
Atrioventricular (AV) 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 (AV bundle), and Purkinje fibers.
Recognize that the 'pacemaker' of the heart is the structure that initiates the electrical impulse causing the heart to beat.
Recall that the SA node is located in the right atrium and is responsible for generating the initial electrical signal, setting the rhythm for the heart.
Conclude that the SA node is known as the pacemaker of the heart because it controls the timing and rate of heartbeats.
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