Question

Maximum amount (about $70-75\%$) of carbon dioxide transport occurs as

• A. Dissolved in plasma
• B. Carbaminohemoglobin complex
• C. Bicarbonate
• D. None of the above

Answer 1

The correct option is C Bicarbonate

About 70% of carbon dioxide molecules that are dissolved in blood is transported to lungs as bicarbonates. Carbon dioxide diffuses into capillaries and then to bloodstream and bicarbonate is produced in erythrocytes. Enzyme carbonic anhydrase causes carbon dioxide and water to form carbonic acid which dissociates into bicarbonate and hydrogen ion.

So the correct option is C.