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HW_2_Statement - Paul Gonzales Pag757 BME 365R Quantitative...

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Paul Gonzales Pag757 BME 365R Quantitative Physiology Homework 2 Due September 20, 2011; 6:00PM 1. (20) A. (6) Pressure is an effort, while airflow represents a flow quantity. The upper airway resistance during resting ventilation when the pressure difference is 1 cmH 2 O is approximately 0.75 L/sec. During hyperventilation the upper airway resistance shows an increase in air flow relative to resting ventilation. The upper airway resistance at a pressure difference of p = 1 cmH 2 O is approximately 1.25 L/sec. B. (6) Unit conversions: 1 cmH20 = 98.1 Pa = 98.1 N/m2 1 L = 1000 mL 1 mL = 1 cm 3 = 1e-6 m 3 1 mL*cmH20 = 98.1e-6 J P resting =f *dP = 0.75 L/sec (1 cmH 2 O) = 0.75 * 1000 *98.1e-6 = 0.07848 W P hyperventilation =f*dP = 1.25 L/sec (1 cmH 2 O) = 1.25 *1000 * 98.1e-6 = 0.122625 W P = I 2 R P resting =0.07848 W= I 2 (1  resting  P hyperventilation =0.122625 W= I 2 (1  hyperventilation  P = V 2 /R P resting =0.07848 W= V 2 /1 V resting V P hyperventilation =0.122625 W= V 2 /1 V hyperventilation V C. (4) X Normal-Expiratory = 1.28 X Emphysema-Expiratory = 1.042
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