The _____ sends out an electrical impulse that regulates the heartbeat.

Question

Quizplus · Accepted Answer

The SA (sinoatrial) node, located in the right atrium of the heart, is known as the natural pacemaker of the heart. It initiates the electrical impulse that travels through the atria and causes them to contract. The impulse then travels to the AV (atrioventricular) node, which slows down the impulse slightly to allow the ventricles to fill with blood before contracting. From there, the impulse travels through the AV bundle and Purkinje fibers to cause the ventricles to contract and pump blood out of the heart. While all of these structures play important roles in regulating the heartbeat, the SA node is the initial source of the electrical impulse.

The _____ Sends Out an Electrical Impulse That Regulates the Heartbeat