A-LevelBiologyGas exchange9700/12 · Feb/Mar 2021 · Q361 Mark
Emphysema is a type of chronic obstructive pulmonary disease (COPD). A person with emphysema has difficulties in breathing out. Why does emphysema cause difficulties in breathing out?
ASmooth muscle fibres in the airways are destroyed.
BToo little mucus is produced in the bronchi.
CThe elasticity of the alveoli decreases.
DThe surface area of the alveoli becomes larger.
✓ Correct answer
C: The elasticity of the alveoli decreases.
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