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Respiratory System (Disorders of the respiratory system (COPO (Major cause…

- - - - Size of thoracic cavity
      - Moves ribs up and sternum forward
      - Forced inhalation-scalences muscles, sternocleidomastoid,and pectoralis
    - - Forced expiration requires contraction of intercostal (ribs) muscles and abdominal muscles
      - Passive process-diaphragm and rib muscles relax