Topic: Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders· Human Physiology

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of :

1. Inspiratory Reserve Volume

2. Tidal Volume

3. Expiratory Reserve Volume

4. Residual Volume

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Answer: 4. Residual Volume

After a forceful expiration some air still stays in the lungs. This is the residual volume, about 1100 mL to 1200 mL.

It keeps the alveoli from collapsing. Inspiratory and expiratory reserve volumes and tidal volume can all be moved by breathing, so they cannot hold the lungs open after forced expiration.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of :

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