The blood when passes by the heart enter by the superior and inferior vena cava, going into the right atrium, passing by the tricuspid valve and in the right ventricle is pushed up until the pulmonary arteries, and this one send the blood to the lamb where the blood will be oxygenated. Then the blood return by the pulmonary veins, going into the left atrium and then passes by the mitral or bicuspid valve, finally goes to the aorta that distributed the blood by the rest of the body, to the legs and arms by the descending aorta.
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