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The majority of carbon dioxide produced by our body cells is transported to the lungs

1. as bicarbonates
2. as carbonates
3. attached to hemoglobin
4. dissolved in the blood

Correct answer: as bicarbonates

Solution

Carbon dioxide entering the blood is mostly converted into bicarbonate ions, which is the primary transport form in plasma. Only a smaller fraction is carried dissolved or bound to hemoglobin.

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