Which of the following describes the AV node's function in the heart?

The function of the atrioventricular (AV) node is crucial in the heart's electrical conduction system. The AV node serves as a critical relay point between the atria and the ventricles, strategically introducing a delay in the conduction of electrical impulses. This delay allows the atria to complete their contraction and fully fill the ventricles with blood before the ventricles initiate their contraction.

By ensuring that the impulses are not passed to the ventricles too quickly, the AV node contributes to the efficiency of the heart's pumping action. It helps maintain a coordinated rhythm, allowing for optimal cardiac output. Understanding the role of the AV node is integral for recognizing its contribution to normal heart function and identifying potential arrhythmias or conduction issues that can arise if this function is impaired.