Discussion
Which one makes blood toxic combining with haemoglobin ?
Answer: B
The gas is Carbon monoxide.
Carbon monoxide binds to the iron of haemoglobin about 200 to 250 times more strongly than oxygen, forming carboxyhaemoglobin. The blood then cannot carry oxygen to the tissues, and a person exposed to it can die of oxygen starvation without noticing anything, since the gas has no colour or smell.
Carbon dioxide is carried by the blood in normal breathing and released in the lungs; methane is not taken up by haemoglobin; oxygen is what haemoglobin is meant to carry.
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