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17 October, 21:28

How does breathing allow large amounts of oxygen into the blood?

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  1. 17 October, 23:55
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    air sacs

    Explanation:

    Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. From there it is pumped to your lungs so that you can breathe out the carbon dioxide and breathe in more oxygen.
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