Which of the following statements is true about RBCs in humans?

They carry about 20-25 per cent of

C O_{2}

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They carry about 99.5 per cent of

O_{2}

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They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma

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They do not carry

C O_{2}

at all

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Solution

The correct option is A They carry about 20-25 per cent of $C O_{2}$
RBCs carry about 20-25 percent of carbon dioxide ( $C O_{2}$ ). 70 percent of it is carried as soluble bicarbonate salts and about 7 percent of $C O_{2}$ is carried in a physically dissolved state via plasma. Thus option a is correct.

About 97 percent of $O_{2}$ (oxygen) is transported by RBCs in the blood. The remaining 3 percent of $O_{2}$ is carried in a dissolved state via the plasma.

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