The figure shows a diagrammatic view of...

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 funciton and / ro characteristic

A

c alveoli thin walled vascualr bag like structures for exchanges of gases

B

d lowere end of lungs diaphragm pulls it down during inspiration

C

a tachea liong tube supported by complete cartilaginous rings for conduction inspired air

D

b pleural membrane surrounds ribes on both sides to provie cushion against rubbing

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A

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