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Question: The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. select t...

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

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

Answer

C – Alveoli – thin walled vascular bag like structures for exchange of gases