phases of the cardiac cycle - diastole, atrial systole and atrial diastole. heart anatomy diagram with blood flow.

heart cardiac cycle diastole atrial systole anatomy diagram blood flow circulation through human organ aorta illustration vector cardiology valve ventricle medical medicine atrium biology section care system health right pulmonary vein isolated internal anatomical artery pump ecg heartbeat cardiovascular vena veins healthy aortic healthcare design disease patient vascular