Which node acts as the gatekeeper of heart electrical conduction?

The AV node, or atrioventricular node, serves as a critical gatekeeper within the heart's electrical conduction system. Its primary role is to receive the electrical impulses generated by the SA node, which initiates the heartbeat. Once the AV node receives these impulses, it provides a crucial delay before transmitting them to the ventricles via the Bundle of His. This delay is essential for allowing the atria to contract and fully empty their blood into the ventricles before the ventricles begin to contract.

By controlling the conduction from the atria to the ventricles, the AV node ensures synchronized contraction of the heart chambers, which is vital for effective pumping of blood throughout the body. Its function as a gatekeeper also protects the ventricles from being overly stimulated by the atrial impulses, allowing the heart to maintain a steady and coordinated rhythm. This regulation is vital for normal cardiac function and contributes to overall cardiovascular stability.