What is it important that the electrical impulse of a heartbeat begins at the apex of the heart and works it way up? What makes sure this happens?
Blood will gather in the right ventricle, located and the bottom-right part of the heart. The electrical current needs to start there and work its way up so that the cardiac muscle will squeeze the blood out of the ventricle, into the pulmonary arteries, and then into the left atrium. Purkinje fibers do this.