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O-LevelBiologyRespiration5090/11 · Oct/Nov 2025 · Q131 Mark

Which sets of muscles contract to cause the body to breathe in?

Adiaphragm and external intercostal muscles
Bdiaphragm and internal intercostal muscles
Cdiaphragm muscles only
Dexternal and internal intercostal muscles

✓ Correct answer

A: diaphragm and external intercostal muscles

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About this question

Topic
Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 13.

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