The atrioventricular (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 (SA) node, which is the heart's primary pacemaker. The AV node delays these signals slightly, allowing the atria to contract and pump blood into the ventricles before they contract. This delay is essential for maintaining an efficient heartbeat and ensuring that the heart functions effectively. After the delay, the AV node transmits the electrical impulses to the ventricles, prompting them to contract and circulate blood throughout the body. Proper functioning of the AV node is vital for maintaining a regular heart rhythm.