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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 given 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

Text Solution

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The correct Answer is:
D
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