![]() The tension developed when an elastic structure is stretched Resistance caused by gas flow and tissue movement during breathing ![]() Note: make sure to know which ones go more negative and positive - when This positive transrespiratory pressure gradient causesĪir to flow from the alveoli toward the airway opening. ![]() The transpulmonary pressure gradient narrows andĪlveolar pressure exceeds that at the airway opening ![]() Transpulmonary pressure gradient reaches maximal value The “negative” (i.e., subatmospheric) transrespiratory pressure gradient causesĪir to flow from the airway opening to the alveoli, increasing their volume. Note: only ones that change are alveolar and pleural pressures Only changes in P alv and P pl are of interest. P bs and P ao remain at 0 (i.e., atmospheric) To expand or contract lungs and chest wall P w is the pressure across the chest wall. Note: has to keep pressure just slightly negative at all times (P L is also commonly represented by the symbol P TP.) The pressure difference that maintains alveolar inflation. The pressure difference between the alveoli and the pleural space, as shown in the following equation: The transpulmonary pressure gradient, or P L, equals The difference in pressure between the atmosphere (body surface) and the alveoli: The trans-respiratory pressure gradient (P rs) represents P pl also varies during the breathing cycle. Negative (i.e., subatmospheric) during quiet breathing. Pleural pressure (P pl) in the fluid of the pleural space is usually ![]() Expiration is normally a passive maneuver.Īlveolar pressure (P alv), often referred to as Work is minimal and performed during the inspiratory phase. ![]()
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