Question

Although much $CO_2$ is carried in blood, yet blood does not become acidic, because

• A. $CO_2$ is absorbed by the leucocytes
• B. Oxygen combines with haemoglobin to form oxyhaemoglobin
• C. $CO_2$ transport and blood buffers play an important role in it
• D. it is continuously diffused through the tissues and is not allowed to accumulate

Answer 1

Answer: (C)

$CO_2$ transport and blood buffers play an important role in it

Answer 2

Although much $CO_2$ is carried-in blood, yet blood does not become acidic. It is due to $CO_2$ transport and buffering action of blood. The main buffer present in the blood is bicarbonate (which is formed during $CO_2$ transport in the blood). Bicarbonates exist in equilibrium with carbonic acid which in turn can be converted to $CO_2$ and water.
${H2O + CO2 <=> H2CO3}$ ${ <=> H+ + HCO^{-}_3}$