In the presence of CO, the oxygen-carrying capacity of the haemoglobin decreases which may cause:

dizziness

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headache

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cardiac and respiratory problems

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all of above

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Solution

The correct option is C all of above
The affinity of CO for haemoglobins much more (about 200 times) than that of oxygen. In the presence of CO, the oxygen carrying capacity of the haemoglobin decreases. The deficiency of oxygen in blood may cause headache, dizziness, cardiac and respiratory problems and even death.

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