Question

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

• A. They carry about 20-25 per cent of $C{O}_2$
• B. They carry about 99.5 per cent of $O_2$
• C. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
• D. They do not carry $C{O}_2$ at all

Answer 1

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.