Question
Biology Question on The respiratory system
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
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
Answer
C-Alveoli thin walled vascular bag like structures for exchange of gases
Explanation
Solution
The correct option is (C): C-Alveoli thin walled vascular bag like structures for exchange of gases.