Final answer:
a. Bundle of His
The wave of depolarization moves to the Bundle of His after the internodal pathways and AV node, continuing the heart's normal rhythm and leading to ventricular contraction.
Step-by-step explanation:
After the wave of depolarization spreads from the internodal pathways and AV node, it next goes to the Bundle of His (a). From the Bundle of His, the impulse then travels through the left and right bundle branches and eventually reaches the Purkinje fibers. This progression is crucial for maintaining the rhythm, or normal electrical pattern, that leads to the contraction of the heart. The impulse initiates in the SA node, spreads throughout the atria, reaches the AV node where there is a delay, and then continues to the Bundle of His, which is part of the atrioventricular bundle. As it proceeds, the impulse travels down the left and right bundle branches and to the Purkinje fibers, leading to ventricular contraction.