Blood comes in from the vena cava into the right atrium to the right ventricle and then through pulmonary artery there is oxygenated by the lungs and returned to the heart by the pulmonary vein. Blood enters into the left atrium then to the left ventricle and out of the heart into the aorta where it is diffuse into smaller and smaller arteries until finally you reach the capillary that system and the blood is then returned towards the heart and small veins collecting and to you reach the vena cava again.
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