MIT Biology Department 7.012: Introductory Biology - Fall 2004 Instructors: Professor Eric Lander, Professor Robert A. Weinberg, Dr. Claudette Gardel 7.012 Neurobiology SECTION Shown below is a graph of membrane potential as a function of time for an action potential traveling down an axon. Membrane potential +50 mV A high Na+BC outsidelow K+ net (+) charge 0 time low Na+ inside axon high K+ net (-) charge outside net (+) charge -70 mV a) For each of the three time points indicated, fill in the following table the statuses of the sodium and potassium channels and the ion fluxes. Please use the terms provided. Time Point A B C Na+ Channel status (Inactivated, Closed, Partially-open, Open) K+ Channel status (Inactivated, Closed, Partially-open, Open) Na+ Flow (into axon, none, out of axon) K+ Flow (into axon, none, out of
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