PHGY 214 Lecture Notes - Lecture 14: Lung Volumes, Vital Capacity, Asthma
28 Apr 2016
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1st: pleural pressure found in the pleural cavity. 2nd panel: alveolar pressure, subatmospheric relative to outside to get inspiration (negative pressure) 3rd panel: overall flow of respiratory system (negative=inspiration) 4th: how much air has moved in and out. Resting at frc (-5), inspiration, levels off at -8. With only elastic, would be linear (not curved) Can actively chang airway tone: sympathetic and parasympathetic. Airways don"t have much air inside them helping to prop them up. Small diameter, resistance to air flow is high. As you continue to breathe in, volume of lungs increase. Stretches out airways, increase diameter, less resistance to air flow. Resistance decreases overtime with the more air you get in your lungs. Straight line: removed any type of air flow resistance, only resistance coming from elastic recoil of lung, less pressure change than curved line. Dashed line: as you increase flow, more noticeable. Don"t need to put in new energy.
