Which sequence correctly lists the cardiac conduction system starting from the SA node?

Study for the Paramedic Aandamp;P Exam. Engage with flashcards and multiple choice questions, complete with hints and explanations. Prepare effectively for your exam!

The sequence tests the order of how electrical impulses travel through the heart’s conduction system. The impulse starts in the sinoatrial (SA) node, the natural pacemaker, and then moves to the atrioventricular (AV) node, which provides a brief delay to allow the atria to contract and ventricles to fill. From the AV node it travels through the bundle of His into the left and right bundle branches, down the interventricular septum, and then disperses through the Purkinje fiber network to rapidly depolarize the ventricles for coordinated contraction. This arrangement—SA node → AV node → bundle of His → bundle branches → Purkinje fibers—permits the necessary conduction delay before ventricular activation and ensures synchronized ventricular contraction. Placing the Purkinje fibers earlier or reversing the AV node and His bundle would disrupt the sequence and prevent proper propagation of the impulse.