What role does the AV node play in myocardial conduction?

The AV node, or atrioventricular node, is a crucial component of the heart's electrical conduction system. Its primary function is to serve as a delaying point for electrical impulses that travel from the atria to the ventricles. As impulses generated by the sinoatrial (SA) node reach the AV node, this structure slows down the conduction of these impulses before they continue to the ventricles.

This delay is essential because it allows adequate time for the ventricles to fill with blood from the atria before they contract. Without this delay, the ventricles might contract too quickly, not allowing enough time to fill adequately, which can compromise cardiac output and overall heart function. Therefore, the role of the AV node is vital in synchronizing the contraction of the heart chambers, ensuring efficient blood flow and effective circulation.

While the other options touch on different aspects of heart physiology, they do not accurately describe the specific function of the AV node in the context of myocardial conduction.