What would a membrane resting potential be if a membrane were equally permeable to K+ and Na+, and not permeable to any other ions?
then the resting potential would be halfway between EK and ENa. For example, if EK = -90 mV and ENa = +60 mV, then V would be -15 mV.
What would a membrane resting potential be if a membrane were equally permeable to K+ and Na+, and not permeable to any other ions?
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The resting potential of a membrane that is equally permeable to K+ and Na+ can be calculated as the average of the equilibrium potentials for those ions.
Given:
– EK (equilibrium potential for K+) = -90 mV
– ENa (equilibrium potential for Na+) = +60 mV
To find the resting potential (V), you can use the following formula:
[ V = frac{EK + ENa}{2} = frac{-90 , text{mV} + 60 , text{mV}}{2} = frac{-30 , text{mV}}{2} = -15 , text{mV} ]
So, if a membrane is equally permeable to K+ and Na+, the resting potential would indeed be -15 mV. This value represents the balance between the driving forces of both ions across the membrane.
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