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.

Moderate

A

C - Alveoli - Thin walled vascular bag like structures for exchange of gases.
B

D - Lower end of lungs - Diaphragm pulls it down during inspiration.
C

A - Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.
D

B - Pleural membrane - Surround ribs on both sides to provide cushion against rubbing.

Solution

Label C- Alveoli - thin walled vascular bag like structures for exchange of gases.
Label A - Trachea - Long tube supported by incomplete cartilaginous rings for conducting inspired air.
Label D - Diaphragm (flattens during inspiration. Dome shaped during expiration)
Label B - Pleural membrane - Encloses the lungs; not ribs.

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