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70 yr old female presents with fast, shallow breathing with wet, wheezy…

- - - - alveoli sacs are lined with simple squamous epithelium
- - - - Henrys Law: how gas will dissolve in the alveoli and bloodstream; the amt in bloodstream is proportional to the partial pressure in the alveolar
      - fall in atmospheric pressure at high altitude decreases the parital pressure of inspired O2 and the driving pressure for gas exchange
        
        partial pressure is the force exerted by gas when blood is exposed to the air in the lungs it will equilibrate so partial pressure of O2 in the lungs is = to O2 in the blood