The __________ is responsible for delaying the action potential before it gets relayed down to the lower half of the heart.
AV node
The atrioventricular (AV) node is responsible for delaying the action potential before it gets relayed down to the lower half of the heart. The AV node is a small bundle of specialized cardiac muscle fibers located in the interatrial septum near the opening of the coronary sinus. It acts as a gatekeeper, controlling the transmission of electrical impulses from the atria to the ventricles. The AV node slows down the electrical impulse, providing a short delay, allowing the atria to contract before the ventricles. This delay ensures that the blood is adequately pumped from the atria into the ventricles before a subsequent contraction occurs. The delay caused by the AV node is essential for proper heart function and is crucial for maintaining synchrony between the atria and ventricles.
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