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Updated: Sep 8 2017

Muscles of Respiration

  • Normal, Quiet Breathing
    • Muscles of inspiration
      • diaphragm
      • external intercostals
    • Muscles of expiration
      • passive process
  • Exercise Breathing
    • Exercise → ↑ respiratory rate, ↑ tidal volume
    • Muscles of inspiration
      • diaphragm
        • contracts downward increasing intrathoracic cavity volume
        • elevates lower ribs
      • external intercostal muscles
        • elevate lower ribs
      • accessory muscles
        • scalenus muscles
          • elevate upper ribs
        • scternocleidomastoid muscle
          • elevate sternum
    • Muscles of expiration
      • internal and external oblique muscles, rectus abdominis, transversus abdominis
        • compress abdominal cavity and push diaphragm upward
      • internal intercostal muscles
        • pull ribs downward and inward
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