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.

Medical

Biology

Upper Respiratory Tract

Question

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

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The alveoli are tiny air sacs within the lungs where oxygen and carbon dioxide exchange occurs. These pulmonary alveoli are the terminal ends of the respiratory tree.

So, the correct answer is option C.

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