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Circulatory system The circulatory system moves blood through the body. capillary A capillary lets air go in the cells and then it lets the air go out. artery Artery are tubes where the blood goes through them .The artery is just like the vein. Heart The heart pumps up blood and oxygen pass and carbon dioxide goes out. Vein The vein lets blood go to different parts of the body and goes to get some oxygen.