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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