A-LevelBiologyGas exchange9700/12 · May/June 2015 · Q321 Mark

The diagram represents a section through the wall of a bronchus (not to scale). In a person with chronic obstructive pulmonary disease (COPD), what happens in each of the numbered structures?

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A1: contracts, 2: contracts, 3: inhibited, 4: not affected

B1: contracts, 2: not affected, 3: overactive, 4: inhibited

C1: relaxes, 2: contracts, 3: inhibited, 4: paralysed

D1: relaxes, 2: not affected, 3: overactive, 4: overactive

✓ Correct answer

B: 1: contracts, 2: not affected, 3: overactive, 4: inhibited

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2015 Paper 1 Variant 2, question 32.

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