midterm_2002

midterm_2002 - 9.09J/7.29J - Cellular Neurobiology, Spring...

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7.29 J 9.09 Cellular Neurobiology Midterm Test 20 March, 2002 Answer Question 1 and four of the five others . Each answer is worth 20 points. If you answer all six questions the first five will be graded. No books, no notes, no cooperation permitted. Calculators are allowed. All lettered subsections of a question have equal point value unless otherwise specified. All questions have specific answers. It is to your advantage to be brief. You may use telegraphic rather than grammatical English if you wish, so long as your reasoning is made clear. Question 1. A space-clamped squid axon is firing an action potential. The top of its overshoot is +50 millivolts, the bottom of its undershoot is –80 millivolts. The .membrane capacitance of the axon is 1 microfarad /cm 2. . (a) At time t during the action potential, the membrane potential , V m = -50 millivolts. At this time, g Na = 2 milliSiemens/cm 2. , and g K = 5 milliSiemens/cm 2. . What is the membrane potential 1 millisecond later. (15 points). (b)
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This note was uploaded on 11/11/2011 for the course BIO 7.344 taught by Professor Bobsauer during the Spring '08 term at MIT.

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midterm_2002 - 9.09J/7.29J - Cellular Neurobiology, Spring...

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