Certified EKG Technician (CET) Practice Exam 2025 - Free EKG Technician Practice Questions and Study Guide

The function of the AV (atrioventricular) node primarily revolves around its role in coordinating the electrical impulses between the atria and ventricles of the heart. It acts as a critical relay point for the impulses that originate in the sinoatrial (SA) node, ensuring that there is a brief delay that allows the atria to fully contract and fill the ventricles with blood before the ventricles contract. This timing is essential for effective cardiac function and maintaining a consistent heartbeat.

The correct choice highlights this essential role of the AV node, emphasizing its function in not just conducting impulses but also ensuring optimal timing for heart contractions. This functionality is critical for efficient pumping of blood throughout the circulatory system. Understanding this aspect of the AV node helps appreciate how the heart maintains its rhythm and the importance of each component in the conduction pathway.