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Unformatted text preview: as a tidal volume of 500mL. Their arterial PCO2 is 40 mm Hg, and they exhale air with PCO2 of 32 mm Hg. What is their dead space volume? Their alveolar ventilation rate? Assume atmospheric PCO2 = 0. a. VT * 32 mm Hg = (VT dead space)*40 mm Hg dead space = VT 32/40*VT dead space = 100mL b. 12 breaths/min * (500-100) = 4.8 L/min 9. (10 points)At time 1, (a) what happens to intrapleural and intrapulmonary pressures if the tidal volume remains constant and airways constrict? Why? (b) What if there is inadequate surfactant production in the alveoli? Why? a. They would both decrease (magnitude increases). Resistance increases because of the smaller airways, so a larger pressure difference is needed to bring air into the lungs at the same rate. b. Intrapleural pressure is the pressure between the lungs and the chest wa...
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This note was uploaded on 05/15/2012 for the course BME 365S taught by Professor Sokolov during the Spring '10 term at University of Texas at Austin.
- Spring '10