what is a circulatory system
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circulatory system is a system that purifies the blood at heart and supply clean blood to body parts
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The circulatory system of the lungs is the portion of the cardiovascular system in which oxygen-depleted blood is pumped away from the heart, via the pulmonary artery, to the lungs and returned, oxygenated, to the heart via the pulmonary vein.
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Hope it's help you friend ☺️
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