PSIO 450 Midterm: PSIO 450 Test 1 Review.docx
9 May 2014
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Document Summary
Static compliance = change in lung volume/ for any given pressure. Dynamic compliance = compliance of the lung at any given time during actual movement of air. This means that the lungs can fill well, however the lungs do not have a good elastic recoil. Low compliance - stiff lungs - (fibrosis, or scarring of the lungs). This causes decreased filling of the lungs with air. Driving pressure depends on force of muscle contraction. Compliance of lungs - ability of lungs to let air flow in - low compliance ( stiff lungs) produces small amount of filling, high compliance (floppy lungs) produces a lot of filling but not a good recoil. Resistance to air flow ( interaction of gases with walls of airways) = frictional resistance. Lots of resistance causes less air to get into lungs. Low resistance causes lots of air to get into lungs. Note: usual units cm h2o: where 1mmhg = 136 cm h2o.
