O-LevelBiologyRespiration5090/11 · May/June 2010 · Q161 Mark

The graph shows changes in the air pressure within the lungs during one breathing cycle. What causes the change in air pressure during stage X? [Figure 16.1]

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Acontraction of diaphragm muscles

Bincrease in volume of lungs

Coutflow of air from lungs

Drelaxation of internal intercostal muscles

✓ Correct answer

C: outflow of air from lungs

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 16.

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