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O-LevelBiologyRespiration5090/11 · May/June 2013 · Q171 Mark

What happens to the diaphragm muscles and to the internal and external intercostal muscles when a person breathes out during exercise?

Adiaphragm: contracts, external intercostal muscles: contract, internal intercostal muscles: relax
Bdiaphragm: contracts, external intercostal muscles: relax, internal intercostal muscles: contract
Cdiaphragm: relaxes, external intercostal muscles: contract, internal intercostal muscles: relax
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, May/June 2013 Paper 1 Variant 1, question 17.

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