Biology 5090 · O Level · Human gas exchange

Human gas exchange — practice question

What occurs when we exhale forcefully?

  • Adiaphragm contracts; external intercostal muscles contract; internal intercostal muscles relax
  • Bdiaphragm contracts; external intercostal muscles relax; internal intercostal muscles relax
  • Cdiaphragm relaxes; external intercostal muscles contract; internal intercostal muscles contract
  • Ddiaphragm relaxes; external intercostal muscles relax; internal intercostal muscles contract

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