The diagram above shows which phenomenon of respiration?

  • A
    Inspiration: Contraction in diaphragm and external intercostal muscles
  • B
    Expiration: Contraction in diaphragm and external intercostal muscles
  • C
    Expiration: Relaxation in diaphragm and external intercostal muscles
  • D
    Inspiration: Contraction in diaphragm and relaxation in internal intercostal muscles

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Explain the mechanism of breathing with neat labelled sketches.

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