Biology · Breathing and Exchange of Gases

In the human respiratory system, which of the following structures is correctly matched with its main function or characteristic?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Diaphragm - pulls the lower end of the lungs down during expiration
2Alveoli - thin-walled vascular bag-like structu res for the exchange of gases✓
3Pleural membrane - surrounds ribs on both sides to provide cushion against rubbing
4Trachea - long tube supported by complete cartilaginous rings for conducting inspired air

Correct answer

Alveoli - thin-walled vascular bag-like structu res for the exchange of gases

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