The cardiac impulse,which causes the heartbea | vedclass

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(B) The cardiac impulse originates at the $SA$ node (Sinoatrial node),which acts as the natural pacemaker of the heart.From the $SA$ node,the impulse

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$AV$ node

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(B) The cardiac impulse originates at the $SA$ node (Sinoatrial node),which acts as the natural pacemaker of the heart.From the $SA$ node,the impulse travels through the internodal pathways to the $AV$ node (Atrioventricular node).The $AV$ node is located in the lower left corner of the right atrium near the interatrial septum.At the $AV$ node,the cardiac impulse is delayed for approximately $0.1$ seconds.This delay is crucial because it allows the atria to complete their contraction and empty their blood into the ventricles before the ventricles begin to contract.

The cardiac impulse,which causes the heartbeat,is delayed in which of the following?

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