The surface tension of the layer of liquid lining the alveoli tends to pull the walls inwards so alveoli could collapse.
Which statements could explain how this is prevented?
1) Alveolar fluid is moved around by cilia.
2) Elastic fibres keep the alveoli open.
3) Epithelial cells secrete a chemical that reduces the cohesion in water.
1 )
1 and 2
2 )
1 and 3
3 )
2 and 3
3 only
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