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It runs throughout your body. The main part is the heart, which pumps blood through arteries that are in all parts of the body. Blood also goes to capillaries which are attached to organs and pass blood from the artery to the vein. Blood in these contain oxygen which is being brought to organs, and parts of the body. When they do not have oxygen anymore, they return to the heart in veins.
It is all over the whole body! The heart is only the pumping station!

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14y ago

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