Question

Read the following statements and select the correct one.

• A. The $H^{+}$ released from carbonic acid combines with haemoglobin to form haemoglobinic acid
• B. Oxyhaemoglobin of erythrocytes is alkaline
• C. More than 70% of carbon dioxide is transferred from tissues to the lungs in the form of carbamino compounds
• D. In lungs, the oxygen from the alveolus reaches the blood through active transport

Answer 1

The correct option is A The $H^{+}$ released from carbonic acid combines with haemoglobin to form haemoglobinic acid

Haemoglobinic acid is a very weak acid formed inside the red blood cells when hydrogen ions produced by the dissociation of carbonic acid combine with the haemoglobin.
Oxyhaemoglobin of the erythrocyte is not alkaline $70$ of $C{O}_2$ is transferred as bicarbonate ion and is therefore acidic. About 20 - 25% of the carbon dioxide is transported in the blood in the form of carbamino haemoglobin. In lungs, the oxygen from the alveolus reaches the blood through simple diffusion.