A-LevelBiologyGas exchange9700/12 · May/June 2011 · Q341 Mark

Which effects does emphysema have? 1 surface area to volume ratio of lungs decreases 2 distance of the diffusion pathway increases 3 volume of oxygen diffused per unit time decreases

A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

C: 1 and 3 only

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 34.

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