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?
1 )
Smooth muscle fibres in the airways are destroyed.
2 )
Too little mucus is produced in the bronchi.
The elasticity of the alveoli decreases.
4 )
The surface area of the alveoli becomes larger.
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