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Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs:

1. as bicarbonate ions
2. in the form of dissolved gas molecules
3. by binding to R.B.C.
4. as carbamino-haemoglobin

Correct answer: as bicarbonate ions

Solution

About 70% of carbon dioxide in blood is converted into bicarbonate (HCO3−) inside red blood cells and then transported in the plasma. This is the dominant carriage form because it is efficient and reversible in the lungs.

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