Final answer:
The impulse is delayed at the atrioventricular (AV) node to allow the atria to contract effectively before reaching the ventricles, ensuring efficient blood pumping.
Explanation:
The impulse is delayed at the atrioventricular (AV) node for about 0.1 second. This delay is crucial as it allows the atria to contract effectively before the signal reaches the ventricles, ensuring efficient blood pumping.
The progression of the electrical impulse from the SA node through the internodal pathways to the AV node and further into the ventricles is essential for maintaining proper heart function and coordinated muscle contractions.
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