The Mechanics of Breathing
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Questions and Answers

Which muscle contracts to lift the ribs upward and outward during inspiration?

  • Sternum
  • Diaphragm
  • Intrapulmonic pressure
  • External intercostal muscles (correct)

    • What happens to the chest during inspiration?

  • The sternum is pushed forward (correct)
  • The thoracic cavity becomes shorter
  • The diaphragm relaxes
  • It contracts and descends

    • What allows air to move from an area of greater pressure to lesser pressure?

  • Contraction of the diaphragm
  • Increased lung volume
  • Relaxation of the external intercostal muscles
  • Decreased intrapulmonic pressure (correct)

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