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progress test - Instructor Dr. B. Trimmer Neurobiology 134...

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Instructor Dr. B. Trimmer Neurobiology 134 Problem set for Equilibrium Potentials, Resting Potentials and Action Potentials. A selectively permeable membrane has the following ion concentrations on each side (these are similar to the concentrations found inside and outside squid axons). Fig. 1 "Outside" | "Inside" Na + 460 mM | 60 mM K + 10 mM | 410 mM Cl - 470 mM | 20 mM A - 0 mM | 450 mM (A - = other anions) 1. What is the potential across the membrane if it is only permeable to K + ? 2. What is the potential across the membrane if it is only permeable to Na + ? 3. What is the potential across the membrane if it is only permeable to Cl - ? 4. Write down the membrane potentials under each of the conditions in 1, 2 and 3 if the ionic concentrations on both sides of the membrane were halved ( i.e. Na + outside = 230 mM, inside = 30 mM, etc ). 5. Suppose that we can change the selectivity of the membrane instantly from one ion to another. Draw what would happen to the membrane potential if, after one second, a chloride selective membrane
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This note was uploaded on 04/28/2008 for the course BIO 134 taught by Professor Trimmer during the Fall '07 term at Tufts.

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progress test - Instructor Dr. B. Trimmer Neurobiology 134...

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