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Respiratory System (Structure (Coverings of lungs (Pleural fluid- prevent…

- - - - Medulla- controls rate and depth
      - direct signals from cerebral motor cortex which bypass medulla
- - - - Active process
      - Intercostal muscles contract and abdominals too
      - Larger volume of air leaving the lungs
      - Greater decrease in intrapulmonary volume
      - Greater increase in intrapulmonary pressure