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Resting potentials

This equation resembles the Nernst equation, but has a term for each permeant ion. Also, z has been inserted into the equation, causing the intracellular and extracellular concentrations of Cl − to be reversed relative to K + and Na +, as chloride's negative charge is handled by inverting the fraction inside the logarithmic term. * E is the membrane potential, measured in volts * R, T, and F are as above * P is the relative permeability of ion s * is the concentration of ion s in compartment Y as above. Another way to view the membrane potential, considering instead the conductance of the ion channels rather than the permeability of the membrane, is using the Millman equation (also called the Chord Conductance Equation):