describe the human circulatory system, using the words blood vessels, pump and valves
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human circulatory system comprises of the heart which pumps the blood throughout the body in which blood is carriedby blood vessels
arteries carries the oxygenated blood to all the cells in the body
veins bring back the deoxygenated blood back to the heart
valves are present in veins to prevent the backflow of deoxygenated blood mixing into oxygenated blood
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