Wednesday, November 12, 2025

SA node

 

In a normally functioning cardiovascular system, where does the heartbeat originate?
In a normally functioning cardiovascular system, the heartbeat does not originate in the atrioventricular node.
In a normally functioning cardiovascular system, the heartbeat does not originate in the bundle of His.
In a normally functioning cardiovascular system, the heartbeat does not originate in the Purkinje fibers.
MY ANSWER
The sinoatrial node is where the heartbeat originates in a normally functioning cardiovascular system. It is considered the "pacemaker" of the heart.

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