Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

Which row gives the correct pairing of muscle contractions and the pressure in the thorax during expiration?

  • Ainternal intercostal muscles contracted; external intercostal muscles contracted; diaphragm contracted; pressure in thorax high
  • Binternal intercostal muscles contracted; external intercostal muscles relaxed; diaphragm relaxed; pressure in thorax high
  • Cinternal intercostal muscles relaxed; external intercostal muscles contracted; diaphragm contracted; pressure in thorax high
  • Dinternal intercostal muscles relaxed; external intercostal muscles relaxed; diaphragm relaxed; pressure in thorax low

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