Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

During inspiration, which muscles in the breathing system contract?

  • Aexternal intercostal and diaphragm only
  • Bexternal intercostal and internal intercostal only
  • Cexternal intercostal, internal intercostal and diaphragm
  • Dinternal intercostal and diaphragm only

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