Where does the cardiac impulse travel after leaving the AV Bundle of His?

The cardiac impulse, after leaving the AV Bundle of His, travels to the ventricular walls. This bundle conducts electrical impulses from the atria into the ventricles, and it branches into the right and left bundle branches that extend into the ventricles. This conduction allows for synchronized contraction of the ventricles, ensuring that blood is efficiently pumped out of the heart to the lungs and the rest of the body.

The timing of this impulse is crucial for effective heart function. It enables the ventricles to contract shortly after the atria have contracted, promoting an organized sequence of heartbeats. This contraction is initiated in the ventricular walls, which is essential for maintaining proper cardiac output and blood circulation.

In contrast, the other options are not accurate pathways for the cardiac impulse after it exits the AV Bundle of His. The impulse does not travel back to the atria (which have already contracted), does not move to the lungs directly (as this pertains to blood flow rather than electrical impulse), and does not go to the aorta. Instead, its direct course leads primarily to the contraction of the ventricular myocardium through the specialized conduction system in the heart.