Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

Blood is the medium of transport of ${\mathrm{O}}_2$ and ${\mathrm{CO}}_2$. Nearly $20-25\%$ of ${\mathrm{CO}}_2$ is transported by RBCs as carbaminohaemoglobin whereas $70\%$ of it is carried as bicarbonate through plasma. About $7\%$ of ${\mathrm{CO}}_2$ is carried in dissolved state through plasma. The largest fraction of ${\mathrm{CO}}_2$ is converted to bicarbonate ions $\left({\mathrm{HCO}}_3^{-}\right)$and transported in plasma. When ${\mathrm{CO}}_2$ diffuses into the RBCs, it combines with ${\mathrm{H}}_2\mathrm{O}$, forming carbonic acid $\left({\mathrm{H}}_2{\mathrm{CO}}_3\right).{\mathrm{H}}_2{\mathrm{CO}}_3$ is unstable and quickly dissociates into hydrogen ions and bicarbonate ions.