PHYSL210B Lecture Notes - Lecture 19: Transpulmonary Pressure, Pulmonary Compliance, Alveolar Pressure
30 Apr 2019
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Document Summary
Change in volume over change in pressure. Less compliance stiff and rigid more than needed; energetically in favourable. No airflow at each point 1,2,3, and 4 of the experiment. Curve starts off and reaches maximum inflation, and then some back and reaches maximum. Inflation and deflation curves do not superimpose on each other properties of lung are different depending on lungs being inflated or deflated. Alveolar pressure is zero, because all measurements are taken in static condition. Deflation curve as more compliance because for the same change in pressure there is a greater change in volume. At just about any given point there is less surface tension during deflation as there is during inflation. Greater amount of surfactant at air-water interface during deflation than inflation to reduce surface tension. Inflating lungs with liquid greater compliance; less surface tension as air-water interface is eliminated. Water molecules at the top/surface do not face upward force, hence resultant force is downwards.
