how our heart sursular the blood
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Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poorblood from the body into the right atrium. ... As the ventricle contracts,blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs, where it is oxygenated.
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The pulmonary veins empty oxygen rich blood from the lungs into the left atrium. This prevents blood from flowing backward into the atrium while the ventricle contracts. As the ventricle contracts,blood leaves the heart through the aortic valve into aorta and to the body
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