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Respiratory System - Gladis Vazquez Period 5, alveoli: simple squamous…

- - - - results from passive process of elastic col muscles&lung tissue& from the surface tension w/in alveoli
      - diaphram&external intercostal muscles relax & lungs recoil
      - as diaphram recoild, abdominal organs springs to their original shape
      - intra: alveolar pressure increase to about 1 mmH above atmospheric pressure
      - result: air rushes out of lungs into atmosphere
    - - allows for expiration of more air that normal
      - aided by interal intercostal muscles & abdomial wall muscles which compress rib cage & abdominal wall