bioe110-spring_09-mt2-Kumar-soln

bioe110-spring_09-mt2-Kumar-soln - flow and causes a...

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BioE 110 Midterm 2 Solutions (1) (A) IRV = VC – ERV –V T =5L – 1.2 L – 0.5 L =3.3L (B) alveolar ventilation rate = (V T – V D )*BR V D = V T *(P aCO2 –P Eco2 )/P aco2 = ( 0 . 5 L ) * ( 3 8 m m H g 3 0 m m H g ) / ( 3 8 m m H g ) = 0 . 105L = ( 0 . 5 L 0 . 105L)*10= 3.95 L/min = 3949 ml/min (C) P AO2 = P IO2 – (P ACO2 /R) R=0.8 P IO2 =(P TOT – P H2O )*X O2 =142.6 mmHg P AO2 = 142.6mmHg – 38mmHg/0.8 P AO2 = 95.1 mmHg (D) Asthma causes constriction of airways in lung, resulting in an increase in resistance. Therefore FEV 1 would decrease. (E) COPD results in an increase in elasticity in the lung. Therefore the pressure needed to prevent collapse of the lungs in greater. The pursed lips increase intramural pressure and prevent collapse. (2) (a) P=2T/R =(2*30mN/m/50x10 ‐6 m)*(1N/1000mN) = 1200 N/m 2 (b) Better ventilation results in an increase in V. Also increased pressure restricts blood
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Unformatted text preview: flow and causes a decreased Q. Therefore the V/Q ratio is increased. (c) Patient likely developed a pneumothorax; the increased pressure punctured lung tissue and caused dissipation of negative pressure in pleural space. This resulted in collapse of the lung. (d) The patient likely developed a clot in the leg (deep venous thrombosis) and that clot resulted in the swelling. The patient also likely developed a Pulmonay embolism causing the short breath and pain in the chest. The blood thinners reduced both and improved the condition. [Note: a dislodged clot in the leg will travel to the lungs.]...
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This note was uploaded on 09/16/2009 for the course BIO ENG 116 taught by Professor Staff during the Spring '08 term at University of California, Berkeley.

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bioe110-spring_09-mt2-Kumar-soln - flow and causes a...

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