Multiple choice

The maximum affinity of hemoglobin is for:

  1. carbon dioxide

  2. carbon monoxide

  3. oxygen

  4. sulphur dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hemoglobin has the highest affinity for carbon monoxide (CO), binding it approximately 200-250 times more strongly than oxygen. This is why CO poisoning is so dangerous - it displaces oxygen from hemoglobin and prevents oxygen transport to tissues.

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