KINE 3012 Lecture Notes - Lecture 3: Intrapleural Pressure, Alveolar Pressure, Transpulmonary Pressure
20 Jan 2018
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What determines change in pressure (delta pressure: atmospheric pressure (patm) pressure of room, 760mmhg, alveolar pressure (palv)- inside lung. Pushes against two ways: against atmosphere & against intrapleural space. If pressure exerted- the(cid:396)e"s p(cid:396)essu(cid:396)e diffe(cid:396)e(cid:374)(cid:272)e; (cid:374)o (cid:373)ove(cid:373)e(cid:374)t p(cid:396)essu(cid:396)es a(cid:396)e (cid:271)ala(cid:374)(cid:272)ed. Air moves out, pressure of lungs is greater than atmosphere. If air moves in, then pressure of atm is greater than pressure of lungs. What determines pressure boyles law (pv=pv: allows us to change pressure by changing volume, volume goes up & pressure goes down. F= p/r: to make air move, pressure needs to change, 760mmhg is force of air pushing in (atmosphere, atmosphere pushes in, alveolar pushes out, alveolar are inside lung. Lung changes volume through change in thoracic size: pressure of intrapleural fluid is less than alveoli change b/t alveolar and intrapleural space. Lung has no ability to change volume, the thoracic changes size causes air to move.
