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Here is a picture of the circulatory system of the human body.
Drag the blue numbers down the left hand side onto the picture to mark these particular parts.
No.1 to where you think the HEART is [the pump which circulates the blood.No.2 where an ARTERY is [these are the tubes which take oxygen rich blood away from the heart]. No.3 to where a VEIN is [these are the tubes which take the oxygen depleted blood back to the heart].