Question

Arrange these elements of the intrinsic conduction system in the order that a depolarizing impulse travels during a normal heartbeat from first to last.

Answer 1

The intrinsic conduction system directs the electrical impulses during a heartbeat in the following order: SA node, internodal pathways/atrial myocardium, AV node (where a delay occurs), AV bundle, right and left bundle branches, and Purkinje fibers, which lead to ventricular contraction.

Step-by-step explanation:

Intrinsic Conduction System of the Heart

The intrinsic conduction system of the heart ensures the heartbeat maintains a proper sequence, allowing the heart to function effectively. To describe the path of a depolarizing impulse during a normal heartbeat, we can list the elements of this system in the order that they activate:

1. 
   

During the cardiac cycle, these steps are reflected in an electrocardiogram by the P wave (atrial depolarization), the QRS complex (ventricular depolarization), and the T wave (ventricular repolarization).