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-take in o2 and take out co2

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The purpose is to transport nutrients, oxygen and hormone cells throughout the body.

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The job of the arteries is to carry blood from heart to the body which also carries nutrients.

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Veins are responsible for bringing deoxygenated blood back to the heart after the arteries carry blood out.

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The heart's role in the circulatory system is to move blood throughout the body.

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Heart and the blood vessels (arteries,capillaries and veins).

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The circulatory system is the system that flows blood throughout your whole body.