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Blood enters the heart through two large veins, the inferior and superior vena cava, carrying full oxygen-deficient blood from the body into the right atrium.The pulmonary vein empties oxygen-rich blood, from the lungs into the left atrium.
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When the heart beats, it pumps blood through a system of blood vessels, called the circulatory system. The vessels are elastic tubes that carry blood to every part of the body. 
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