Question

Choose the correct statement about human RBC.

• A. They carry about 20-25 percent of $C{O}_2$.
• B. They transport about 80% oxygen and the rest 20% is transported in a dissolved state in plasma.
• C. They transport 99.5% oxygen.
• D. They do not carry $C{O}_2$ at all.

Answer 1

The correct option is A They carry about 20-25 percent of $C{O}_2$.

23% of $C{O}_2$ is combined with haemoglobin and transported as carbaminohaemoglobin.
About 70% of $C{O}_2$ is transported as bicarbonates.
7% of $C{O}_2$ gets dissolved and transported through the plasma.
Only 1.5 percent of oxygen in the blood is dissolved directly into the blood itself. Most oxygen, 98.5 percent, is bound to a protein called hemoglobin and carried to the tissues.