Question

The majority of carbon dioxide produced by our body cells is transported to the lungs-

• A. Dissolved in the blood
• B. As carbonates
• C. Attached to hemoglobin
• D. As bicarbonates

Answer 1

The correct option is D As bicarbonates

Carbon dioxide is transported in three different ways from tissue to lungs-

• As dissolved in blood
• As carbaminohemoglobin
• By forming bicarbonate and hydrogen ions

Most of the carbon dioxide $\left(70\%\right)$ is transported from tissue to lungs as bicarbonates. $20-25\%$ of carbon dioxide is transported as carbamino-haemoglobin attached to haemoglobin.