A) A-trachea-long tube supported by complete cartilaginous rings for conducting inspired air
B) B-pleural membrane-surround ribs on both sides to provide cushion against rubbing
C) C-alveoli-thin walled vascular bag-like structures for exchange of gases
D) D-lower end of lungs-diaphragm pulls it down during inspiration
Correct Answer: C
Solution :
C-Alveoli are thin-walled vascular bag-like structures for exchange of gases. A-trachea or wind pipe is an air conducting tube through, which transport of gases takes place. B-pleural membrane is double layered, which reduces friction on the lung surface. D-diaphragm is involved in the inspiration and expiration process of breathing.
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