NPB 113 Lecture Notes - Lecture 25: Surface Tension, Lung Volumes, Apse
3 Apr 2021
School
Department
Course
Professor
Document Summary
T p collapse = f f . H2o molecules to reduce the surface tension for. Hysteresis : inflation and deflation of lung different. I l l trans pulmonary pressure (mmhg ! During inflation ( from nearly collapsed lung ) : " at low lung volumes : alveoli relatively small. In diameter large surface tension. (cid:8869) initially low compliance : not much change in volume regardless of increasing pressure. " then dp required to inflate the lung becomes somewhat constant until - 90-951 . At large lung volumes : elastic recoil. Is strong , alveoli stretched out and elastin recoiling strongly (cid:8869) low compliance : greater sp required to further increase the volume. On the deflation limb always smaller than the sp required on the inflation limb for a given volume inflate then deflate w/ h2o : no hysteresis deflation. O t 4 mm itg 15 it: :" l. At frc , chest wall has natural. tendency to expand outwards.
