Question

In blood carbon monoxide forms ...................... that is unable to transport oxygen.

Answer 1

Carbon monoxide has about 200 times more affinity for haemoglobin as compared to oxygen. Normally haemoglobin binds to four oxygen molecules and forms oxyhaemoglobin which dissociates to release oxygen in the body tissues. Carbon monoxide binds with haemoglobin and forms carboxyhaemoglobin which is unable to transport oxygen in the body. This is known as carbon monoxide poisoning and ultimately leads to death.

So, the correct answer is 'Carboxyhaemoglobin'.