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O-LevelBiologyRespiration5090/11 · Oct/Nov 2015 · Q171 Mark

What happens when we breathe out with force?

Adiaphragm contracts, external intercostal muscles contract, internal intercostal muscles relax
Bdiaphragm contracts, external intercostal muscles relax, internal intercostal muscles relax
Cdiaphragm relaxes, external intercostal muscles contract, internal intercostal muscles contract
Ddiaphragm relaxes, external intercostal muscles relax, internal intercostal muscles contract

✓ Correct answer

D: diaphragm relaxes, external intercostal muscles relax, internal intercostal muscles contract

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About this question

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

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