Exam 3 Spring 2005

Exam 3 Spring 2005 - BISC 220 Third hourly examination 8...

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BISC 220 Third hourly examination 8 April 2005 Please circle your TA's initials: SB AC MC XLiang XLiu JLui JLu CP HP KR JS YingW YuanYuan JW KC Name___________________________________ 9 AM EXAMINATION ID Number_____________________ This exam consists of NN questions on N pages. Be sure you have a complete copy. Please put your name and SID on the top of each page. For each of the following questions choose the one best answer. Write your answer in only the space provided—answers elsewhere will not be graded. The point value of each question is indicated. You have 50 minutes to complete this exam. Use your time wisely. Good luck from all your teaching staff. -1- Points on this page 1. (4 pts.) Which one of the following is not a function of the liver? (b) 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. (10 pts.) Briefly describe the anatomical arrangement of the hepatic portal vein and explain its significance. 3. (4 pts.) Why is the velocity of blood flow lower in capillaries than in arteries? (e) 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. Answer in box Answer in box ANS: Capillaries in the small intestine drain into the hepatic portal vein, which conveys blood to another capillary bed in the liver. By this arrangement, nutrient-rich blood from the intestine is conveyed directly to the liver, which metabolizes and processes the nutrients. Answer in box
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Name -2- Points on this page 4. (10 pts.) What determines whether the net movement of fluid will be out of capillaries into surrounding tissues or from the surrounding tissues into capillaries? ANS: The movement of fluid out of or into capillaries is determined by the balance between the outwardly directed blood pressure force and the inwardly directed force due to the osmotic (oncotic) pressure of plasma proteins. In addition, increasing the permeability of capillaries increases transport of fluids. 5. (10 pts.) 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. ANS: The systems are 1) the bicarbonate buffer in the plasma, 2) the ability of the lung to blow off
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Exam 3 Spring 2005 - BISC 220 Third hourly examination 8...

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