What correctly describes the role of elastic fibres in the lungs?
They allow the walls of stretched alveoli to recoil as air is breathed out.
2 )
They increase in the walls of alveoli as a result of the release of the enzyme elastase.
3 )
They increase in the walls of the alveoli as emphysema develops.
4 )
They prevent the walls of the alveoli from collapsing as air is breathed in.
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