Which blood vessel returns blood from the systemic circuit to the heart?

The superior vena cava returns blood from the upper part of the systemic circuit to the heart. The coronary sinus is where blood from the myocardium returns to the right atrium of the heart. The aorta received freshly oxygenated blood from the heart to begin the systemic circuit. The pulmonary vein returns freshly oxygenated blood to the heart from the lungs in the pulmonary circuit.