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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:
A
D – Lower end of lungs – diaphragm pulls it down during inspiration
B
A – trachea – long tube supported by complete cartilaginous rings for conducting inspired air
C
B – pleural membrane – surround ribs on both sides to provide cushion against rubbing
D
C – Alveoli – thin walled vascular bag like structures for exchange of gases
Detailed Solution
C is the alveoli, thin-walled, vascularised bag-like structures where gases are exchanged.
The trachea is supported by incomplete cartilaginous rings, and the pleural membranes surround the lungs, not the ribs.
The trachea is supported by incomplete cartilaginous rings, and the pleural membranes surround the lungs, not the ribs.