O-LevelBiologyRespiration5090/11 · Oct/Nov 2017 · Q181 Mark

Which row shows the state of the muscles when breathing out as deeply as possible?

Adiaphragm muscles contracted, external intercostal muscles contracted, internal intercostal muscles relaxed

Bdiaphragm muscles contracted, external intercostal muscles relaxed, internal intercostal muscles contracted

Cdiaphragm muscles relaxed, external intercostal muscles contracted, internal intercostal muscles relaxed

Ddiaphragm muscles relaxed, external intercostal muscles relaxed, internal intercostal muscles contracted

✓ Correct answer

D: diaphragm muscles relaxed, external intercostal muscles relaxed, internal intercostal muscles contracted

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2017 Paper 1 Variant 1, question 18.

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