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Can you pick the path that a red blood cell follows in the circulatory system starting in the right atrium?
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Starting in the right atrium, can you click the path through the chambers and valves of the heart that a red blood cell would flow through?
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Follow a drop of blood from right atrium to finger on right hand and back to right atrium
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Follow a drop of blood from right atrium to the little toe on left foot and back to right atrium