Question

$CO_{2}$ is transported in blood mostly by means of

• A. plasma
• B. bicarbonate ion
• C. carbaminohaemoglobin
• D. None of the above

Answer 1

Answer: (B)

bicarbonate ion

Answer 2

Transport of carbon dioxide by blood is much easier than that of oxygen due to high solubility of $CO _{2}$ in water. $7 \%$ of $CO _{2}$ is dissolved in plasma, $23\%$ as carbaminohaemoglobin and $70 \%$ as bicarbonates. Major fraction of carbon dioxide released during cellular respiration is transported by blood in the form of sodium bicarbonate in plasma.