Symptoms of chronic obstructive pulmonary disease (COPD) include a cough, breathlessness and chest infections.
Some of the changes in the lungs that result from smoking are listed.
1) Alveoli lose elastin and collapse.
2) Bacteria accumulate in the mucus.
3) Cilia are inactivated.
4) Goblet cells secrete more mucus.
Which changes cause the cough in COPD?
1 )
1, 2, 3 and 4
2 )
1 and 4 only
3 )
2 and 3 only
3 and 4 only
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