What is the normal pacemaker of the heart?Multiple ChoicePurkinje fibersSinoatrial nodeAtrioventricular nodeAV bundle
Question
What is the normal pacemaker of the heart?
- Multiple Choice
- Purkinje fibers
- Sinoatrial node
- Atrioventricular node
- AV bundle
Solution
Understanding the Pacemaker of the Heart
The heart has a specialized group of cells that regulate the heartbeat and maintain its rhythm. This group acts as the heart's natural pacemaker. Let's analyze the options provided:
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Purkinje Fibers: These fibers distribute the electrical impulse to the heart muscles, but they are not responsible for initiating the heartbeat.
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Sinoatrial Node (SA Node): The SA node is located in the right atrium and is known as the primary pacemaker of the heart. It generates electrical impulses that initiate each heartbeat and set the pace for the heart rate.
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Atrioventricular Node (AV Node): This node is situated between the atria and ventricles and serves as a relay point for impulses from the SA node but does not initiate impulses.
-
AV Bundle (Bundle of His): This structure conducts impulses from the AV node to the ventricles. Like the Purkinje fibers, it is not responsible for pacing the heart.
Conclusion
The normal pacemaker of the heart is the Sinoatrial Node (SA Node). It is responsible for starting the electrical impulses that regulate the heart's rhythm. Thus, the correct answer is:
Sinoatrial node.
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