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21 June, 12:33

The majority of carbon dioxide returns to the lungs

as part of

hemoglobin.

plasma.

oxygen.

bicarbonate ions.

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Answers (2)
  1. 21 June, 12:40
    0
    Oxygen, it couldn't be plasma or hemoglobin or bicarbonate ions.
  2. 21 June, 12:46
    0
    Carbon dioxide returns to the lungs as part of Bicarbonate ions. It is transported as part of the bicarbonate system.
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