May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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18Gas ExchangeHard1 mark
The diagram shows part of the breathing system in humans.
Side view of the rib cage with a boxed region between two ribs enlarged, showing two ribs joined by muscle fibres, one layer of which is labelled M
What is the function of the type of muscle labelled M in the diagram?