O-LevelBiologyTransport in Humans5090/12 · May/June 2016 · Q171 Mark

The diagram represents some of the muscles involved with breathing. [Figure with ribs, breastbone, spine, and muscles P, Q, R] Which muscles are contracting during breathing in?

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.

AP and Q

BQ and R

CP and R

DP, Q and R

✓ Correct answer

C: P and R

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Topic: Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 2, question 17.

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