May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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19Gas ExchangeMedium1 mark
The graph shows the changes in volume of the thorax when a human is inspiring and expiring.
Graph of volume of thorax / cm³ against time: small regular breaths between about 2500 and 3000, with P a small peak and Q the small trough after it, then a deep breath rising to a peak R at 6000 and falling to a trough S at 1200, followed by small breaths again with T a small peak
Which row shows the regions on the graph when the internal and external intercostal muscles are contracting?
internal intercostal muscles contractexternal intercostal muscles contract
AP to QR to S
BQ to RS to T
CR to SQ to R
DS to TP to Q