HEART, ILLUSTRATION. HEART, ILLUSTRATION Cardiac revolution : auricular systole and ventricular diastole. The oxygenated blood in red enters through the pulmonary veins into the left atrium auricular systole, then passes into the left ventricle ventricular diastole. The desoxygenated blood in blue enters through the vena cavae superior and inferior into the right atrium auricular systole, then passes into the right ventricle ventricular diastole. See image 2013607 for the rest of the cardiac rev