A-LevelBiologyGas exchange9700/12 · May/June 2015 · Q311 Mark
What correctly describes the role of elastic fibres in the lungs?
AThey allow the walls of stretched alveoli to recoil as air is breathed out.
BThey increase in the walls of alveoli as a result of the release of the enzyme elastase.
CThey increase in the walls of the alveoli as emphysema develops.
DThey prevent the walls of the alveoli from collapsing as air is breathed in.
✓ Correct answer
A: They allow the walls of stretched alveoli to recoil as air is breathed out.
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