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Posted_Old_Exam_3_2005_9am

Posted_Old_Exam_3_2005_9am - BISC 220 Exam 3 Questions 9 am...

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1 BISC 220 Exam 3 Questions 9 am, Spring 2005 1. Which one of the following is not a function of the liver? a. Synthesis of bile. b. Secretion of alkaline fluid to neutralize stomach acid. c. Converting glycogen to glucose while fasting between meals. d. Processing the remnants of worn-out red blood cells. 2. Briefly describe the anatomical arrangement of the hepatic portal vein and explain its significance. 3. Why is the velocity of blood flow lower in capillaries than in arteries? a. Capillary walls are thin, so as to allow exchange of O 2 and CO 2 with tissues. b. Capillaries are far from the heart, and blood flow slows as distance from the heart increases. c. The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate. d. The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle. e. The total surface area of the capillaries is larger than the total surface area of the arteries. 4. What determines whether the net movement of fluid will be out of capillaries into surrounding tissues or from the surrounding tissues into capillaries? 5. There are 3 independent systems that operate to maintain the pH of body fluids within the narrow limits that are compatible with life. Briefly describe these 3 pH-regulating systems. Indicate which one acts most rapidly and which one has the greatest capacity.
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