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.

Question

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-trachea-long tube supported by complete cartilaginous rings for conducting inspired air, B-pleural membrane-surround ribs on both sides to provide cushion against rubbing, C-alveoli-thin walled vascular bag-like structures for exchange of gases, D-lower end of lungs-diaphragm pulls it down during inspiration

MARKS App · Accepted Answer

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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