. . . " ??? ??? ??? aorta the large trunk artery that carries blood from the left ventricle of the heart to branch arteries ??? ??? ??? systemic circulation circulation that supplies blood to all the body except to the lungs and heart ??? ??? ??? sinoatrial node a specialized bit of heart tissue that controls the heartbeat ??? ??? ??? atrioventricular node a node of specialized heart muscle located in th" . .