Question

What is true about $\text{RBCs}$ in human $?$

Answer 1

Transport of oxygen

Oxygen is transported throughout the body in two forms:

$\bullet$ Oxygen bound to haemoglobin in red blood corpuscles $\left(\text{RBC}\right)$

$\bullet$ Dissolved form in the plasma

While most of the oxygen $\left(\text{about}97\%\right)$ is transported in the form of oxyhaemoglobin, the rest $3\%$ gets dissolved in the plasma.

Transport of carbon dioxide

Carbon dioxide is transported throughout the body in three forms:

$\bullet$ Bicarbonates $\left(70\%\right)$

$\bullet$ Carbaminohemoglobin- About $23\%$ of the carbon dioxide is transported by haemoglobin in the blood.

$\bullet$ Dissolved form in the plasma $\left(7\%\right)$

Final answer:

$\left(D\right)$ They carry $20-25\%C{O}_2.$