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O-LevelBiologyRespiration5090/12 · Oct/Nov 2015 · Q161 Mark

What happens to the diaphragm and the external intercostal muscles when breathing in?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Acontracts
Bcontracts
Crelaxes
Drelaxes

✓ Correct answer

A: contracts

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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 2, question 16.

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