O-LevelBiologyRespiration5090/11 · Oct/Nov 2011 · Q171 Mark

The diagram shows the ribs and some of the muscles used in breathing. Which muscles relax in moving from position X to position Y? [Figure 17.1]

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Ano, no

Bno, yes

Cyes, no

Dyes, yes

✓ Correct answer

D: yes, yes

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2011 Paper 1 Variant 1, question 17.

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