O-LevelBiologyRespiration5090/11 · May/June 2016 · Q181 Mark

The diagram shows changes in the volume of a person's lungs over a period of two minutes. [Figure 18.1] What could cause the change in the pattern of the graph between points X and Y?

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Achanging from running to walking

Bchanging from walking to running

Cincreased frequency of contractions of the internal intercostal muscles

Dincreased strength of contractions of the internal intercostal muscles

✓ Correct answer

B: changing from walking to running

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 18.

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