⚡ How Does Your Heart Beat? ⚡ It all starts with the heart's conduction system, a network of electrical signals that keeps the heart beating in rhythm. The sinoatrial (SA) node, located in the right atrium, acts as the heart's natural pacemaker, generating impulses that cause the atria to contract. These signals then travel to the atrioventricular (AV) node and down through the bundle of His and Purkinje fibers, causing the ventricles to contract. This ensures that your heart pumps blood efficie