What produces the pulse rate?

The heart's electrical system produces the pulse rate. The heart's electrical system is called the conduction system. The conduction system consists of the sinoatrial (SA) node, the atrioventricular (AV) node, and the bundle of His. The SA node is located in the right atrium and is the natural pacemaker of the heart. It generates electrical impulses that travel through the heart, causing the atria to contract. The AV node is located between the atria and the ventricles and delays the electrical impulses slightly, allowing the atria to fill with blood before the ventricles contract. The bundle of His is a network of fibers that conducts the electrical impulses from the AV node to the ventricles, causing the ventricles to contract.