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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 m
Question

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

Correct option is D

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