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1. The conducting structures are protected from collapsing during inhalation, but the alveoli are at ...

1. The conducting structures are protected from collapsing during inhalation, but the alveoli are at risk of collapsing at the end of exhalation, even in the dry desert. Explain the force that could cause the wet surfaces of the alveoli to stick together, especially at the end of a long vocal outburst, like yelling or crying.

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The alveoli are small, thin-walled sacs lined with a moist (fluid) surface and this moisture creates a powerful physical force that can cause the alveoli to collapse especially at the end of exhalation or after a long vocal outburst such as yelling, crying or singing.

The Force Behind Alveolar Collapse: Surface Tension

The force that causes the wet surfaces of the alveoli to stick together is surface tension.

Why does surface tension occur?

The inner surface of each alveolus is coated with a thin film of water.

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