Solved UPSC CDS/OTA Question
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Q · Circulatory Systemmedium · 45s
Which component of blood is responsible for oxygen transport?
TopicCirculatory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Red blood cells contain hemoglobin, an iron-containing protein that reversibly binds O₂ in pulmonary capillaries. RBC’s biconcave shape increases surface area for diffusion; 120-day lifespan and absence of nucleus optimize hemoglobin packing.
Final Answer: Option B - Red blood cells