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breathing mechanisms (Elastic properties (compliance (measure of lung +…

- - - - eliminate need for major muscles
      - may be insufficient for laboured breathing
        
        accessory muscles may be needed
  - - - opposite directions
- - - - lower surface tension = coating air =- liquid interface in alveoli
      - surfacetant
        
        detergent like effect
        
        separates liquid molecules = decrease alveolar surface tension
        
        line alveolar side of alveolar-capillary membrane + reverse Laplace's law
        
        alveoli easily inflate
        
        not produced adiquantly = alveolar surface tension increases = alveolar collapse = decreased lung expansion = increased work of breathing = abnormal gas exchange
        
        decreased surface tension = keep alveoli fluid free
        
        abscence = water move into alveoli = pulmonary odema
    - - pressure required to inflate the sphere = 2x surface tension / size of the radius
- - - - negative pressure
        
        draws air into lungs
  - - - increase volume