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

A: Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.

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D: Lower end of lungs - Diaphragm pulls it down during inspiration.

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B: Pleural membrane - Surrounds ribs on both sides to provide cushion against rubbing.

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C: Alveoli - Thin-walled vascular bag-like structures for exchange of gases.

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Solution

The correct option is D
C: Alveoli - Thin-walled vascular bag-like structures for exchange of gases.

Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream.

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

The correct option is D C: Alveoli - Thin-walled vascular bag-like structures for exchange of gases. Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream.

The correct option is D
C: Alveoli - Thin-walled vascular bag-like structures for exchange of gases.

Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream.