STANDARD Zoology Human Respiratory System MCQ Question
The figure shows a diagrammatic view of the human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic
D - Lower end of lungs - diaphragm pulls it down during inspiration
A - Trachea - long tube supported by complete cartilaginous rings for conducting inspired air
B - Pleural membrane - surrounds ribs on both sides to provide a cushion against rubbing
C - Alveoli - thin-walled vascular bag-like structures for the exchange of gases
Correct Answer
Detailed Explanation
In the given figure A is the trachea. It is supported by incomplete cartilaginous rings which prevent its collapse during inspiration B is the pleural membrane. It encloses lungs, C are alveoli. They are thin-walled sacs having extensive network of capillaries for gaseous exchange D is the diaphragm.
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