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Unformatted text preview: This circuits function depend on nonlinear synaptic mechanisms. Today, we will focus on models for action potentials. Equivalentcircuit models for action potentials are RC circuits with many conductances. c m dV dt = ! i m + I e A If A is the membrane surface area, c m is the capacitance per unit area, and i m is the sum of all membrane currents per unit area, then i m = g L V ! E L ( ) + g K n 4 V ! E K ( ) + g Na m 3 h V ! E Na ( ) Disregarding synapses (g s ), and making n , m , and h the probabilities of opening of activation and inactivation of voltagedependent gates, the HodgkinHuxley model is One can conceptualize these gates in molecular terms. A. K + channel B. Na + channel Individual channels are allornone and have random opening times. c m dV dt = ! i m + I e A If A is the membrane surface area, c m is the capacitance per unit area, and i m is the sum of all membrane currents per unit area, then i m = g L V ! E L ( ) + g K n 4 V ! E K ( ) + g Na m 3 h V ! E Na ( ) Disregarding synapses (g...
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 Spring '09
 Grzywacz

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