sample_midterm_2 - Midterm 2 - NPB 101 Winter, 2007...

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Midterm 2 - NPB 101 Winter, 2007 Guidelines: (1) Write your name and provide your student ID# on the front of your scantron. (2) Sign your scantron. (3) Indicate on the front of your scantron that you are using Testform A . (4) If you finish early, but after 4:45, remain in your seat until the end of the exam. At 4:55 the Instructor, TA and Proctors will collect all scantrons. **************************************************************************************** ____ 1. A function of troponin is a. bind Ca2+. b. form attachments with myosin cross bridges. c. communicate with the foot proteins to release Ca2+ from the sarcoplasmic reticulum. d. serve as an ATPase. e. None of these answers. ____ 2. When skeletal muscle relaxes a. the A band shortens. b. the I band broadens. c. the H zone shortens. d. (a) and (c), above. e. (b) and (c), above. ____ 3. The sarcoplasmic reticulum a. is prevalent in skeletal, cardiac and smooth muscle. b. stores ATP as creatine phosphate for immediate energy needs c. contains a high density of Ca2+ pumps to sequester Ca2+. d. provides a route for the action potential to invade the interior of the skeletal muscle cell. e. releases calmodulin to phosphorylate myosin kinase. ____ 4. Which of the following is not involved in the relaxation of muscle? a. when acetylcholine is destroyed by acetylcholinesterase. b. when there is no longer a local action potential. c. when the T tubules actively take up the Ca 2+ that had been released. d. when the actin and myosin molecules are no longer bound together. e. when the troponin-tropomyosin complex slips back into its blocking position. __ 5. Single-unit smooth muscle a. contains an abundance of gap junctions and forms a functional syncytium. b. is self-excitable. c. surrounds the capillaries and large veins d. (a) and (b), above. e. (b) and (c), above. ____ 6. Muscle tension depends on a. the number of motor units recruited. b. the frequency of stimulation. c. extent of fatigue. d. Both (a) and (b), above. e. (a), (b) and (c), above.
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____ 7. During a cross-bridge cycle in skeletal muscle, the a. cross bridge is energized as myosin ATPase activity hydrolyzes ATP. b. myosin cross bridge is able to bind with an actin molecule when Ca 2+ pulls the troponin- tropomyosin complex aside. c.
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This note was uploaded on 05/02/2008 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Winter '08 term at UC Davis.

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sample_midterm_2 - Midterm 2 - NPB 101 Winter, 2007...

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