In chronic obstructive pulmonary disease (COPD), airflow through the airways is reduced.
Which statements explain the reduced airflow?
1 More mucus is secreted into the airways.
2 Airways and alveoli lose their elasticity.
3 Many of the alveoli are destroyed.
4 Carbon monoxide binds irreversibly to haemoglobin.
1 )
1, 2, 3 and 4
1, 2 and 3 only
3 )
1, 3 and 4 only
4 )
2, 3 and 4 only
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