bisc307 exam final _sp. 05%2C byerly_

bisc307 exam final _sp. 05%2C byerly_ - Final Exam BISC...

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Final Exam BISC 307L - General Physiology May 4, 2005 1. Answer all of the 24 questions. READ EACH CAREFULLY! 2. Note that questions have different point values. In all, 130 points are possible. 3. You have two hours for this exam, about 5 minutes for a 5-point question. 4. Write your answer within the box or blank given for each question. Material written outside these spaces will not be graded. 5. Abbreviations used in lecture are acceptable. 6. Calculators are NOT allowed. 7. Show your work in solving quantitative problems. Partial credit will be given for correct procedure, even if answer is incorrect. 8. Make you answers as brief as possible. Points will be subtracted for irrelevant material. WRITE YOUR NAME ON EACH PAGE Your Name: _______________________________________________________ Please CIRCLE the Lab Section you are in : Tuesday morning Tuesday afternoon Wednesday morning Wednesday afternoon Thursday morning Thursday afternoon Friday morning Friday afternoon
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NAME ____________________________________ Page 2 of 9 1. (6 points) Give typical values for P CO2 and P O2 in (a) alveolar air, and (b) freshly inhaled air in the nasal passage. (c) How can these numbers be used to calculate the respiratory exchange ratio (R) for the individual? 2. (4 points) How does congestive heart failure affect lung function? Briefly explain the mechanism of this effect. 3. (6 points) Suggest (in the table below) reasonable values for the lung pressure (P L ) and pleural pressure (P Pl ) during the given three conditions of breathing. Pressures are measured relative to atmospheric pressure; P B = 0. P L (mm Hg) P PL (mm Hg) All respiratory muscles relaxed. 0 -3.7 During expiration from above condition. +1 -1 After maximum inspiration. No air flow. 0 -7 a) In alveolar air, P O2 = 102 mH; P CO2 = 40 mH. b) In fresh air, P O2 = 150 mH; P CO2 = 0 mH. c) R = (CO 2 produced) / (O 2 consumed) = (40 – 0) / (150 – 102) = 0.8 Congestive heart failure produces pulmonary edema, which decreases the ability of the lung to exchange gases. The reduced ability of the left ventricle to pump blood causes the pressure in the pulmonary vein (and capillaries) to increase. This increases capillary filtration, causing edema.
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NAME ____________________________________ Page 3 of 9 4. (6 points) Why are smaller alveoli more prone to collapse (than larger alveoli) in premature infants? How is this problem solved in the lungs of a healthy infant? 5. (8 points) The ventilation/perfusion ratio (V A / Q) is 0.2 for a region of the lung. Estimate values for the partial pressure of O 2 and CO 2 for the alveolar air in this region. What changes will each of the abnormal partial pressures produce in local bronchioles or arterioles? 6.
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This note was uploaded on 05/03/2010 for the course BISC 307L taught by Professor Herrera during the Spring '08 term at USC.

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bisc307 exam final _sp. 05%2C byerly_ - Final Exam BISC...

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