Solved UPSC CDS/OTA Question
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Q · Digestive Systemmedium · 45s
Which structure increases the surface area of the small intestine?
TopicDigestive System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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The small intestine’s mucosa features circular folds (plicae circulares), villi, and brush border microvilli, collectively amplifying the absorptive surface by up to 600-fold compared to a simple tube, maximizing nutrient absorption.
Final Answer: Option D - Both B and C