explain double circular system
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During the process of double circulation ,blood passes through the heart twice.The deoxygenated blood enter the right atrium through vanae cavae . It flows to right ventricle and pumped into lungs through pulmonary arteries . Here the blood is oxygenated and brought back to left atrium through pulmonary veins . It then flows to the left ventricle and then ti different parts of body.
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