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Respiratory (pulmonary ventilation (inspiration (inspiratory muscles…

- - - - external intercostals
        
        lift rib cage
      - diaphram
        
        flattens out
  - - - dramatic increase in interpulmonary pressure
        
        allows for quick and forceful exhale
  - - - additional muscles are added
        
        scalenes, sternalclidomastoid
- - - - surfactant
        
        reduces surface tension