What is true about RBCs in humans?

A) They transport 99.5 per cent of O2

B) They carry about 20­-25 per cent of CO2

C) They do not carry CO2 at all

D) They transport about 80 per cent oxygen only

Answer: B) They carry about 20­-25 per cent of CO2

Explanation: About 97 per cent of O2 is transported by RBCs in the blood as oxyhaemoglobin and 20-25 per cent of CO2 is transported by RBCs as carbamino-haemoglobin.

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