Question

Although blood caries a lot of $C{O}_2$, it does not become acidic due to _______.

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

Answer 1

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

Sodium bicarbonate (a buffer), present in blood, plays an important role in carbon dioxide transportation. During carbon dioxide transportation, carbonic acid is formed. Carbonic acid dissociates in hydrogen ion and bicarbonate ion. This bicarbonate ion combines with sodium and forms sodium bicarbonate. Thus the concentration of carbonic acid does not increase in blood.

So, the correct answer is "In $C{O}_2$ transport blood buffers play an important role".