Resp_fall2009_hw2

Resp_fall2009_hw2 - Respiratory HW #2 Due Sept 16 1. A...

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Respiratory HW #2 Due Sept 16 1. A glucose sensor has a diffusional coating with a thickness of 80 micrometers and a diffusion constant (glucose in water) of 5.2e-6 cm 2 /sec. Compute the unit step responses for a diffusional model at the sensor surface. Plot for t=1 to 60 and 1-600 seconds. C(x,t)=erfc(x/(2*sqrt(D*t)) for diffusion erfc=complementary error function (in Matlab) 2. The following data is collected for the single breath DLCO test: Barometric pressure is 640 mm Hg, spirometer temperature=20 deg C, body temperature is 37 deg C The subject starts at residual volume and inspires 5 liters (ATPS) to total lung capacity a gas mixture with 14% helium,0.3% carbon monoxide, 21% oxygen, and balance nitrogen. There is a 10 second breath-hold followed by a rapid exhalation where expired breath reaches a plateau indicating 10 % helium and 0.1% carbon dioxide. Calculate DLCO(STPD) in ml min -1 mm Hg -1 3.A body plethysmograph is used to measure airway resistance. With the subject in the box 10 ml of air injected into the box results in 0.012 cm H20 pressure change.
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Resp_fall2009_hw2 - Respiratory HW #2 Due Sept 16 1. A...

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