Where does the impulse go after the Bundle of His?

Once the electrical impulse travels through the Bundle of His, it continues its pathway through the specialized conduction system of the heart by branching into the left and right bundle branches. These branches then lead to the Purkinje fibers. The Purkinje fibers are responsible for transmitting the electrical impulse rapidly throughout the ventricles, allowing for coordinated contraction of the heart muscle, which is essential for effective pumping of blood.

The role of the Purkinje fibers is critical as they ensure that the ventricles contract in a synchronized manner, which maximizes the efficiency of the heart's pumping action. The impulse must reach these fibers to initiate the final phase of the cardiac cycle, allowing the ventricles to contract and eject blood into the pulmonary artery and aorta.

Other choices refer to structures or areas of the heart that are not part of the conduction pathway following the Bundle of His. The pulmonary artery is a blood vessel, the left atrium is involved in receiving oxygenated blood, and the right ventricle is a chamber that pumps deoxygenated blood to the lungs; they do not receive the electrical impulse directly after the Bundle of His.