The atrioventricular node (AV node) is a small cluster of cells located in the heart, specifically between the atria and ventricles. It plays a crucial role in the heart's electrical conduction system by receiving signals from the sinoatrial node (SA node) and delaying them before passing them to the ventricles. This delay allows the atria to contract and pump blood into the ventricles before they contract. The AV node ensures that the heart beats in a coordinated manner, maintaining an efficient flow of blood throughout the body. If the AV node is damaged or malfunctioning, it can lead to various heart rhythm disorders, affecting overall heart function and health.