Solved UPSC CDS/OTA Question
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Q · Respiratory System Medium · 45s
The functional unit of the lungs is:
TopicRespiratory System
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Alveoli are tiny air sacs where gas exchange (oxygen and carbon dioxide) occurs between the air and the blood. The other options are parts of the respiratory system, but they don't perform the primary gas exchange function.
Final Answer: Option B - Alveolus