A-LevelBiologyGas exchange9700/12 · Oct/Nov 2018 · Q351 Mark

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?

A1, 2, 3 and 4

B1 and 4 only

C2 and 3 only

D3 and 4 only

✓ Correct answer

D: 3 and 4 only

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 35.

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