the figure shows a diagrammatic view of human respiratory system with labels A, B , C and D . Select the option which given correct identification and main function and / or characteristic

Options

A. A trachea long tube supported by complete caritlaginous rings for conducting inspired air
B. B-pleural memebrane surround ribs on both sides to provide cushinon against rubbing
C. C-alveoloi thin walled vascular bag like structures ffor exchanged of gases
D. D-lower end of lungs diaphragm pulls it down during inspiration

Answer

C

Explanation

C- Alveoli are thin walled vascualr 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 memebrane is double layered which reduces friction on the lung surface.D- diaphragham is involved in the inspiration and expriation p[rocess of breathing.