Patient Care Technician (PCT) AAH Practice Exam

The main function of the atrioventricular (AV) node is to delay the electrical signal before it is transmitted to the ventricles via the Purkinje fibers. This delay is crucial as it allows sufficient time for the atria to contract and pump blood into the ventricles before the ventricles begin to contract. This coordinated timing is essential for maintaining an efficient and effective heartbeat.

The AV node serves as a critical relay point in the electrical conduction system of the heart. It ensures that the atrial contraction finishes before the ventricular contraction starts, promoting proper blood flow and maximizing cardiac output. The role of the AV node in delaying the impulse is vital for the heart's overall function.

Understanding this function highlights the importance of the AV node in the heart's conduction pathway and its role in ensuring synchronized contractions of the heart chambers.