Cardiovascular system Version en ligne Match the par Mayra Rubio 1 The sinoatrial (SA) node 2 The atrioventricular (AV) node 3 The atrioventricular (AV) bundle 4 The Purkinje fibers located in the upper wall of the right atrium initiates the cardiac cycle by generating an action potential that spreads through both atria through the gap junctions of the cardiac muscle fibers located near the lower region of the interatrial septum, receives the action potential generated by the SA node. A slight delay of the electrical transmission occurs here, allowing the atria to fully contract before the action potential is passed on to the ventricles receives the action potential from the AV node transmits the impulse to the ventricles by way of the right and left bundle branches are large‐diameter fibers that conduct the action potential the interventricular septum, down to the apex, and then upward through the ventricles
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