C-Alveoli are thin-walled vascular bag-like structures for exchange of gases. A-trachea or wind pipe is an air conducting tube through, which transport of gases takes place. B-pleural membrane is double layered, which reduces friction on the lung surface. D-diaphragm is involved in the inspiration and expiration process of breathing.
NEET UG 2013 — Zoology Breathing and Exchange of Gases
2013mcqmedium
The figure shows a diagrammatic view of human respiratory system with labels A,B,C and D. Select the option, which gives correct identification and main function and/or characteristic. 
Official previous-year question
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Options
- A
A-trachea-long tube supported by complete cartilaginous rings for conducting inspired air
- B
B-pleural membrane-surround ribs on both sides to provide cushion against rubbing
- C
C-alveoli-thin walled vascular bag-like structures for exchange of gases
- D
D-lower end of lungs-diaphragm pulls it down during inspiration
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