Ventilation: Static Forces. Lung Compliance Elastic Recoil Surface Tension. Lung Compliance. Air flow in lungs: no muscles in the alveoli; air passively moves in/out of the lungs in response to pressure gradients. Forces are present that resist the opening of the lungs, I.e., the alveoli
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pressure within the alveoli themselves tend to keep the lungs inflated
Reduced surface tension within the alveoli
(more about this later)
it takes a certain inflation pressure to maintain or support a liquid bubbleLaPlace’s Law & Surface Tension
The higher the surface tension, the more pressure required to inflate the bubbleThe effects of increasing surface tension on pressure
As radius decreases, pressure to hold bubble open increasesSurface tension and bubble size