Normal Electrical Conduction

The heart functions to pump blood to the lungs and the body. In order to pump, the heart requires an electrical impulse just like any other muscle in the body. The electricity for the heart originates from the sinus node in the upper right corner of the right atrium. Electricity then spreads across both atria before reaching the AV node where it momentarily pauses. From the AV node, electricity then rapidly passes through the right and left bundle branches to reach the ventricles. As electricity passes through the ventricles, the muscle is stimulated to contract.