Ex3_2006 - BioG 101 Cornell University Dec. 7, 2006 EXAM 3...

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BioG 101 Dec. 7, 2006 Cornell University C. D. Hopkins Exam 3 - 2006 1 EXAM 3 (2006) MULTIPLE CHOICE. Choose the one best answer from among those given. Mark the answer on the op-scan sheet provided. Keep a record of each of your answers on these pages so that you can correct your test using the answer key provided on the course website. Exam tip : There is no penalty for guessing. Your score is determined by the number of correct answers. 1. (1 pt) How is most of the carbon dioxide transported by the blood in humans? A) CO 2 attached to hemoglobin B) carbonic acid in the erythrocytes C) bicarbonate attached to hemoglobin D) CO 2 dissolved in the plasma E) bicarbonate ions in the plasma 2. (1 pt) Which of the following is an example of countercurrent exchange? A) the flow of water across the gills of a fish and that of blood within those gills B) the flow of water across the skin of a frog and that of blood within the ventricle of its heart C) the flow of air within the primary bronchi of a human and that of blood within the pulmonary veins D) the flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary E) the flow of blood in the dorsal vessel of an insect and that of air within its tracheae 3. (1 pt) Which chambers or vessels in this diagram of the human heart carry deoxygenated blood? A) 1 and 2 only B) 1, 2, and 4 C) 5 and 6 only D) 1, and 6 only E) 3, 5, and 6
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BioG 101 Dec. 7, 2006 Cornell University C. D. Hopkins Exam 3 - 2006 2 4. (1 pt) Which of the following is NOT an adaptation of red blood cells for improving gas exchange and oxygen transport. A) Red blood cells have a large diameter which increases the amount of oxygen-carrying molecules. B) Internal organelles including the nucleus and mitochondria are absent from red blood cells, providing more room for hemoglobin. C) Red blood cells utilize a tetrameric protein for oxygen transport which increase the efficiency of oxygen exchange. D) The flattened shape of the RBC increases surface area of the cell for diffusion to take place. E) Red blood cells generate ATP using anaerobic metabolism. 5. (2 pts) Through how many capillary beds must a human red blood cell travel if it takes the shortest possible route from the right ventricle to the right atrium? A) zero B) one C) two D) three E) cannot tell from the information given. 6. (2 pts) A molecule of oxygen must pass all but one of the structures below to get from an alveolus in lung to a glial cell in the brain? Which is the exception? A) left ventricle B) an endothelial cell C) pulmonary vein D) portal vein in the hypothalamus E) left atrium 7. (2 pts) A decrease in pH of the blood during exercise will cause: A) a decrease in breathing rate B) a decrease in heart rate C) a decrease in CO2 binding to hemoglobin D) a decrease in affinity of hemoglobin for oxygen in the tissues E) a decrease in cardiac output 8. (1 pt) In the inflammatory response, the absence of which of the following would prevent all
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Ex3_2006 - BioG 101 Cornell University Dec. 7, 2006 EXAM 3...

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