Posted_Old_Exam_3_2005_10am - BISC 220 Exam 3 Questions 10...

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1 BISC 220 Exam 3 Questions 10 am, Spring 2005 1. Which one of the following is not a function of the liver? a. Converting glucose to glycogen immediately following a meal. b. Processing nutrients returning from the intestine via the hepatic portal vein. c. Synthesis of digestive enzymes to be secreted into the small intestine. d. Synthesis of plasma proteins. 2. Pepsin is one of the few enzymes that works best in the highly acidic environment of the stomach contents. Digestive enzymes in the duodenum, however, require neutral or slightly alkaline levels of pH in order to function. Explain the mechanisms that allow duodenal enzymes to function even though the stomach continually releases its acidic contents into the duodenum. 3. In which one of the following structures is average blood pressure the lowest? a. aorta d. venae cavae b. venules e. arteries c. arterioles f. capillaries 4. In the glomeruli of the kidney, capillaries leak fluid into Bowman’s capsule. In contrast, nearby capillaries absorb water from the proximal tubule. Briefly explain the forces that cause fluid flow to be oppositely directed in these two locations. 5. Briefly explain why exercise tends to lower the pH of the blood, and how the respiratory system acts to counteract that change in pH. 6. When you hold your breath, which of the following changes in blood gas concentration causes the strongest urge to breathe? a. rising O 2 b. falling O 2 c. rising CO 2 d. falling CO 2 e. rising CO 2 and falling O 2 7. Which one of the following statements about lungs is false? a. Blood is slightly cooled as it passes through the lung.
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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Posted_Old_Exam_3_2005_10am - BISC 220 Exam 3 Questions 10...

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