A-LevelBiologyGas exchange9700/12 · Oct/Nov 2014 · Q331 Mark

The graph shows the volume of air breathed out quickly and with force, following a deep breath in, for three different people, X, Y and Z. [Figure 33] What is a possible explanation for the differences in the volume of air breathed out by these people shown?

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Achronic bronchitis: X, emphysema: Z, normal lung function: Y

Bchronic bronchitis: Y, emphysema: X, normal lung function: Z

Cchronic bronchitis: Y, emphysema: Z, normal lung function: X

Dchronic bronchitis: Z, emphysema: Y, normal lung function: X

✓ Correct answer

C: chronic bronchitis: Y, emphysema: Z, normal lung function: X

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2014 Paper 1 Variant 2, question 33.

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