Final answer:
The depolarization wave after the AV node moves to the AV bundle and then through the bundle branches to the Purkinje fibers, leading to the contraction of the ventricles.
Step-by-step explanation:
After the wave of depolarization spreads from the internodal pathways and the atrioventricular (AV) node, it proceeds to the AV bundle (also known as the bundle of His). There is a slight delay to allow the atria to complete their contraction and pump blood into the ventricles. This impulse then moves down through the AV bundle and bundle branches to the Purkinje fibers. The depolarization continues to the right papillary muscle via the moderator band before it ultimately spreads to the contractile fibers of the ventricles, leading to ventricular contraction.
The transmission of this impulse is essential for the coordinated contractions that pump blood through the heart and into the systemic circulation. The entire process ensures that the atria have emptied before the ventricles begin to contract, allowing for efficient circulation of blood throughout the body.