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As an analogy, you could say that the paper boy is like a red blood cell, he goes to the paper shop or depot to fill up his bag (hemoglobin molecule), which is like blood cells going to the lungs to pick up oxygen molecules. Then he gets on his bike and travels around the streets, which are like the blood vessels, to the houses, which are like the tissues of the body. He delivers the papers (oxygen molecules) to the houses (tissues of the body) then he goes back to the papershop (lungs) to get more papers (oxygen molecules

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13y ago

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