Biology 5090 · O Level · Human gas exchange

Human gas exchange — practice question

Which row indicates the condition of the muscles during the deepest possible exhalation?

  • Adiaphragm contracted; external intercostal muscles contracted; internal intercostal muscles relaxed
  • Bdiaphragm contracted; external intercostal muscles relaxed; internal intercostal muscles contracted
  • Cdiaphragm relaxed; external intercostal muscles contracted; internal intercostal muscles relaxed
  • Ddiaphragm relaxed; external intercostal muscles relaxed; internal intercostal muscles contracted

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