PHYSL214 Lecture 15: PHYSL 214 - Lecture #15 - Dynamics of Ventilation
4 Mar 2017
School
Department
Course
Professor
Document Summary
Physl 214 - lecture #15 - dynamics of ventilation: lung volumes and lung capacities - spirometry, tidal volume, amount of normal breathing (amount of air we"re taking in, which is typically. Intrathoracic pressure will go up significantly: since bronchioles collapse before the alveoli collapse, so this, 2 important physiological functions will trap the air in the alveoli, 1. If we empty all the air out of the alveoli, we wouldn"t have any air left to participate in gas exchange: there must be always constant gas exchange, so that gas levels in blood stay relatively constant, 2. ***if we collapse our alveoli, it takes a tremendous amount of pressure to pop them open: this is because thin layer of fluid wants the alveoli to collapse (due to surface tension) If you collapse all the alveoli, you will have to work a lot more to breathe: vital capacity.
