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The figure shows a diagrammatic view of ...

The figure shows a diagrammatic view of huma repiratory system with labels A, B C and D. Select the option which give scorrect identification oand main funciton 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 counducting inspired air.

C

B-pleural membrance surround ribs on both sides to provide cushion against rubbing.

D

C-alveoli-thin walled vascular bag like structures for exhange of gases.

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The correct Answer is:
(d)
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