O-LevelBiologyRespiration5090/11 · May/June 2017 · Q161 Mark

Which changes occur in the diaphragm and intercostal muscles when a person breathes in?

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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

A: diaphragm: contracts, external intercostal muscles: contract, internal intercostal muscles: relax

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Topic: Respiration, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2017 Paper 1 Variant 1, question 16.

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