bisc307--final %28sp. 06%29

bisc307--final %28sp. 06%29 - Final Exam BISC 307L -...

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Final Exam BISC 307L - General Physiology May 3, 2006 1. Answer all of the 27 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 8 AM Tuesday 11:30 AM Tuesday 3 PM Wednesday 8 AM Wednesday 2 PM Thursday 8 AM Thursday 11:30 AM Thursday 3 PM Friday 8 AM Friday 2 PM
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NAME ____________________________________ 1. (5 points) The barometric pressure on a Colorado mountain is 600 mmHg. Assume the water vapor pressure is 24 mm Hg at 100% humidity. What will be the oxygen partial pressure (P O2 ) of the air entering a person’s bronchi at this location? P 02 = ( 600 – 24 ) x (0.21) = 121 mmHg 2. (5 points) Assume the air entering a person’s bronchi has P O2 = 150 mmHg and that the alveolar gas has P O2 = 100 mmHg and P CO2 = 45 mmHg. What is the respiratory exchange ratio (R) for this person? Is this person on a high-fat diet? (4 points) R = (CO 2 produced) / (O 2 consumed) = 45 / 50 = 0.90 (1 point) This person is probably not on a high-fat diet. R is too close to 1.0. 3. (4 points) Compare the blood flow in the top part of the lungs to that in the bottom part. Why do they differ? __The blood flow is greater in the bottom of the lungs, because the blood pressure is almost twice as great and the capillaries there are expanded in cross-section. Capillaries at the top may even be collapsed. ________________________________________________________ The volume of blood in the pulmonary capillaries is almost the same as ___the stroke volume ___ 4. (6 points) Write (in the table below) reasonable values for the lung pressure (P L ) and pleural pressure (P Pl ) during the given three conditions of breathing. Be sure your values for the three conditions are consistent. 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 (-3 to -4; X) During strong inspiration from above condition. -2 (<0 & >Y) -8 (<X; Y) After maximum expiration. No air flow. 0 -1 (>X) Page 2 of 8
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NAME ____________________________________ 5. (6 points) The ventilation/perfusion ratio (V A / Q) is 1.2 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? (Only
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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--final %28sp. 06%29 - Final Exam BISC 307L -...

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