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When excersising, the body will create atp, which requires more oxygen so the heart will increase the rate of pump to stay constant with the need

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Arteries carry oxygenated blood away from the heart to the tissues

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The vein is responsible for returning deoxygenated blood back to the heart after arteries carry blood out.

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The heart sends blood around your body. The blood provides your body with the oxygen and nutrients it needs. It also carries away waste.

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What makes up the circulatory system?