Question

Although much $C{O}_2$, is carried in blood yet blood does not become acidic because

• A. $C{O}_2$ is continuously diffused through the tissues and is not allowed to accumulate
• B. $C{O}_2$ combines with water to form $H_{2}C{O}_3$, which neutralised by $N{a}_{2}C{O}_3$
• C. In $C{O}_2$ transport, blood buffers play an important role
• D. $C{O}_2$ is absorbed by leucocytes

Answer 1

The correct option is C In $C{O}_2$ transport, blood buffers play an important role

Although much CO${}_2$ is carried in blood yet blood does not become acidic because of the buffering action of blood. Due to blood buffering, it does not become acidic in spite of the presence of large amount of CO${}_2$. The main buffer present in the body is bicarbonate. Bicarbonate exists in equilibrium with carbonic acid which in turn can be converted to carbon dioxide and water.

H${}_2$O+CO${}_2$⇌H${}_2$CO${}_3$⇌H${}^{+}+$HCO${}_3$${}^{-}$.

Thus, the correct answer is option C.