Which structure in the heart carries the electrical impulse to the ventricles?

The bundle branches are responsible for carrying the electrical impulse to the ventricles in the heart. After the electrical signal is generated by the sinoatrial (SA) node, it travels through the atrioventricular (AV) node and then into the bundle of His. From the bundle of His, the impulse is divided into two bundle branches—one for the left ventricle and one for the right ventricle. These branches further split into Purkinje fibers, which distribute the impulse throughout the ventricular myocardium, leading to coordinated contraction of the ventricles.

This process is critical for effective heart function, as it ensures that the ventricles contract in a synchronized manner to efficiently pump blood to the lungs and the rest of the body. Other structures mentioned, such as the SA node and the AV node, are involved in the generation and transmission of the electrical impulse but do not carry it directly to the ventricles. The coronary arteries supply blood to the heart muscle but have no role in the conduction of electrical impulses.