Exam1Key - BIPN 142 Exam #1- KEY Student No: January 25,...

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p. 1 BIPN 142 Exam #1- KEY January 25, 2010 Name (Print): Student No: Exam guidelines 1. This is a closed book, closed note exam. Work by yourself and do not talk with any other students. You have ~50 min (until 9:50 AM) to hand in the exam. 2. You may work in pen or pencil; however, ONLY EXAMS COMPLETED IN NON- ERASEABLE INK WILL BE ELIGIBLE FOR REGRADES . 3. IT IS ABSOLUTELY ESSENTIAL that you print your name on the top of each page. Pages will be separated for grading. 4. You should confine your answers to the space provided. If you must write outside that space, use the back of the same page, and mark clearly that you have done so. Please do not write in this box. PAGE 2: PAGE 3: PAGE 4: TOTAL POINTS: PAGE 5: PAGE 6: GRADE
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Name (print):_________________________________ Student Number __ KEY _________________ p. 2 PART A: Circle the best answer. Each correct choice is worth 3 points 1. Proprioceptors firing action potentials encode a signal’s intensity typically by a. firing at precise intervals. b. changing the size of their action potentials. c. changing how long each action potential lasts. d. sending signals of different sizes to different spinal cord neurons. e. none of the above 2. For a membrane that is permeable only to K + ions, which of the following statements about electrochemical equilibrium and membrane potential is true ? a. electrochemical equilibrium involves the movement of small quantities of ions. b. ionic gradients are necessary for the generation of the membrane potential. c. the size of the membrane potential can be estimated from the ratio of ion concentrations across the membrane. d. the direction of the ion gradient determines the polarity of the membrane potential. e. all of the above 3. The resting membrane potential is not exactly equal to the Nernst potential for potassium because a. the Nernst equation is not able to predict potentials that precisely. b. potassium does not contribute to the resting membrane potential. c. rapid fluctuations in membrane potential prevent accurate measurements. d. the membrane has some permeability to species other than potassium. e. All of the above 4. Which of the following is important for the unidirectional propagation of action potentials? a. The voltage dependence of the sodium channels b. The voltage dependence of the potassium channels c. The presence of a refractory period at a location where an action potential has just fired d. The capacity of axons to function as perfect insulators and prevent current leakage and back propagation e. All of the above 5. Peripheral sensitization a. occurs only after repeated injuries to a particular portion of the body. b. is distinguished from hyperalgesia, in that it mainly concerns pleasant stimuli.
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This note was uploaded on 04/13/2010 for the course BIOLOGY bipn144 taught by Professor Someone during the Spring '10 term at UCSD.

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Exam1Key - BIPN 142 Exam #1- KEY Student No: January 25,...

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