Atrium and ventricles separated by one-way mitral and triscupid valves 4. Ventricles and circulations separated by pulmonary and aortic valves 5. Coronary circulation B. Pulmonary circulation 1. Four pulmonary veins return oxygenated blood from lungs to left ventricle C. Systemic circulation 1. Blood leaves left ventricle via large artery, the aorta 2.
Heart pumps approx.