Explain why the membrane potential of a resting neuron is typically around 260 to 280 mv

Nernst equation is 62mV x log (conc ions outside/conc ions inside) Ion movement through ion channels creates a membrane potential. K+ conc at equilibrium is -90mV but because of the positive charge of Na+ inside, the ways of Na+ is opposite K+ and creates a charge less negative inside the cell. The resting potential reflects the small movement of sodium ions across a few open sodium channels in the resting neuron. 

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