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Question

What is true about RBCs in humans?

A
They carry about 20-25 per cent of CO2
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B
They transport 99.5 per cent of O2
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C
They transport about 80 per cent oxygen only and the remaining 20 per cent of it is transported in dissolved state in blood plasma
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D
They do not carry CO2 at all
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Solution

The correct option is A They carry about 20-25 per cent of CO2
Oxygen and carbon dioxide are circulated across the body through the blood in different forms. Nearly 70% of carbon dioxide is carried by the blood as bicarbonate, 20-25% as bound to RBCs, and around 7% in a dissolves state through plasma. However, in the case of oxygen, nearly 97% is transported by RBCs (as bound to haemoglobin), while the remaining 3% is carried in a dissolved state through the plasma.

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