CO is harmful to human being because:
Correct answer: C. It competes O2 to combine with haemoglobin
- A. It decreases CO2 concentration
- B. It is carcinogenic
- C. It competes O2 to combine with haemoglobin
- D. It depletes O3 layer
Explanation
CO competes with oxygen for haemoglobin-binding sites and has a much greater affinity for haemoglobin, thereby reducing oxygen delivery to tissues. Its principal acute danger is this oxygen transport failure, not ozone depletion.
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