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Now we know that the venous blood from the systemic and portal circulation is brought to the right atrium of the heart during the systole of the ventricle the blood is pumped from the right ventricle into the pulmonary artery. the venous is brought to the through the in the lungs the blood discharges out carbon dioxide. when the oxygenated blood has passed the four pulmonary veins it is brought to the left atrium of the heart. under the pressure in the left atrium the arterial blood which the pulmonary veins have brought to the heart is pumped into the left ventricle. during the prolonged contraction of the left ventricle, the so-called ventricular systole, the arterial blood is pumped into the aorta the main artery of the vascular system. when the left ventricle has pumped the arterial blood into the aorta it is carried through the arteries to all the parts of the body.