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What is true about RBCs in humans?

1. They carry about 20–25 per cent of CO₂.
2. They transport 99.5 per cent of O₂.
3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma.
4. They do not carry CO₂ at all.

Correct answer: They carry about 20–25 per cent of CO₂.

Solution

RBCs do carry carbon dioxide, mainly by binding it to hemoglobin as carbaminohemoglobin. About 20–25% of CO₂ is transported this way, while most is carried as bicarbonate in plasma.

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