How does such exchange work

How does such exchange work?

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With the help of red blood cells in your blood-stream. Your red blood cells are similar to box cars on train tracks. They show up at the sacs at merely the right time, ready to trade in old carbon dioxide which your body's cells have build for some new oxygen you have just breathed in. In this procedure, such red blood cells turn from purple to that beautiful red color as they begin fetching the oxygen to all cells in your body.   

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