Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

What occurs when a person inhales?

  • AThe external intercostal muscles and the internal intercostal muscles contract.
  • BThe external intercostal muscles and the internal intercostal muscles relax.
  • CThe external intercostal muscles relax and the internal intercostal muscles contract.
  • DThe external intercostal muscles contract and the internal intercostal muscles relax.

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