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These tubes (along with the heart) are known as the circulatory system, and they come in three varieties: arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries are smaller diameter tubes connecting arteries and veins, through which blood interacts with tissues of the body.

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Adele O'Hara

Lvl 10
4y ago

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