SP03 Final Exam Key


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BIPN 102, MAMMALIAN PHYSIOLOGY, II ANSWER KEY Page 1 SPRING 2003 JUNE 9, 2003 FINAL EXAM Dr. P.A. George Fortes Select the single best answer 1. During a tidal expiration, a. the diaphragm contracts b. the abdominal muscles contract c. the scalenes contract d. the internal intercostals contract e. there is no muscle contraction 2. P IP > P A a. during a normal expiration b. during a forced expiration c. during a normal inspiration d. during a forced inspiration e. never 3. The compliance of an alveolus increases when a. the pressure increases b. the radius decreases c. the amount of surfactant increases d. the amount of surfactant decreases e. the surface tension increases 4. A person with a fibrotic lung disease will have a. increased lung compliance b. FEV 1 /FVC < 0.8 c. decreased total lung capacity d. increased residual volume e. increased FRC 5. During a severe asthmatic attack, Joe’s airways have been reduced to ½ their normal radius. By how much will Joe have to increase the pressure gradient in order to achieve a normal amount of air flow? a. 2 times b. 4 times c. 8 times d. 16 times e. No change – it is not possible to change the pressure gradient
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ANSWER KEY Page 2 SPRING 2003 JUNE 9, 2003 FINAL EXAM Dr. P.A. George Fortes 6. A man fills his lungs as much as he can, then exhales until his functional residual capacity remains. Which of the following is true as he exhales? a. the flow rate of air increases with increased effort b. the flow rate becomes independent of effort c. the flow rate is independent of the radius of the airway d. the typical volume expelled will be 1.2 L e. abdominal muscle contraction is required to expel this air 7. Which of the following will be true of a previously normal person whose alveolar wall thickens to twice the normal thickness? a. P AO2 decreases to half its normal value b. Oxygenation of blood at rest becomes diffusion-limited c. Oxygenation of blood during intense exercise becomes diffusion-limited d. The diffusion rate of CO 2 from the blood to the lungs will decrease to half its normal value e. Both (c) and (d) 8. Jill hikes to the top of a mountain, where P atm = 650 mm Hg. At this location, what will be the P O2 in her bronchi at the end of a tidal inspiration? a. 136.5 mm Hg b. 126.6 mm Hg c. 89.5 mm Hg d. 86.6 mm Hg e. 47.6 mm Hg 9. A man has a tidal volume of 0.5 L and a respiration rate of 10 breaths/minute. He starts breathing through a 200 ml snorkel. What should be his total minute ventilation in order to maintain the same alveolar P O2 ? a. 5 L/min b. 5.5 L/min c. 6 L/min d. 6.5 L/min e. 7 L/min 10. Which of the following decreases from the top to the bottom of the lung in a person standing upright? a.
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