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What percentage of \( C O_{2} \) flows in blood in form of bicarbonates?

1. 7\%
2. 23\%
3. 50\%
4. 70\%

Correct answer: 70\%

Solution

Carbon dioxide is transported in blood mainly after conversion to bicarbonate ions (HCO3−) inside red blood cells. This is the dominant form, accounting for about 70% of CO2 transport.

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