Question

Carbon dioxide combines with haemoglobin to form____________.

• A. Carboxyhaemoglobin
• B. Carbaminohaemoglobin
• C. Carbhaemoglobin
• D. None of these

Answer 1

Answer: (A)

Explanation of the correct option:

1. Haemoglobin (Hb or Hgb) is a protein in red blood cells that carries oxygen to cells and carbon dioxide to the lungs.
2. ${CO}_2$ is carried by haemoglobin as carbamino-haemoglobin.
3. Binding of ${CO}_2$ to Hb occurs because in the tissues the p${CO}_2$ is high and p$O_2$ is low.
4. About 20-25 per cent ${CO}_2$ is transported in the form of Carbaminohaemoglobin.
5. Hence ${CO}_2$ combines with Hb to form Carbaminohaemoglobin.
6. So, the correct answer is 'Carbaminohaemoglobin'.

Explanation of the correct option:

Other Options A,C and D didnot satisfy the appropriate explanation of the given question.

Final answer: Carbon dioxide combines with haemoglobin to form Carbaminohaemoglobin.