Solved UPSC CDS/OTA Question
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Q · Respiratory System medium · 45s
Hemoglobin has the highest affinity for which gas?
TopicRespiratory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Carbon monoxide binds to the heme iron in hemoglobin with an affinity over 200 times greater than oxygen, forming carboxyhemoglobin and preventing oxygen transport. Even low CO concentrations can cause hypoxia, illustrating its lethal toxicity.
Final Answer: Option C - Carbon monoxide