Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

Which row indicates how the muscles act during inspiration?

  • Ainternal intercostal muscles contract; external intercostal muscles relax; diaphragm relax
  • Binternal intercostal muscles contract; external intercostal muscles relax; diaphragm contract
  • Cinternal intercostal muscles relax; external intercostal muscles contract; diaphragm relax
  • Dinternal intercostal muscles relax; external intercostal muscles contract; diaphragm contract

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