Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

What occurs at the beginning of inspiration?

  • Ainternal intercostal muscles contract; external intercostal muscles relax; diaphragm contracts; volume of thorax increases
  • Binternal intercostal muscles contract; external intercostal muscles relax; diaphragm relaxes; volume of thorax decreases
  • Cinternal intercostal muscles relax; external intercostal muscles contract; diaphragm contracts; volume of thorax increases
  • Dinternal intercostal muscles relax; external intercostal muscles contract; diaphragm relaxes; volume of thorax increases

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