O-LevelBiologyRespiration5090/11 · May/June 2015 · Q171 Mark

The diagram shows the rib cage and some of the muscles involved in breathing as seen from the side. [Figure 17.1] What happens when the intercostal muscles shown in the diagram contract?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThe diaphragm moves down.

BThe lungs inflate.

CThe pressure inside the lungs decreases.

DThe ribs move down.

✓ Correct answer

D: The ribs move down.

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2015 Paper 1 Variant 1, question 17.

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