Is K+ or Na+ more permeable?
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The membrane is permeable to K+ at rest because many channels are open. In a normal cell, Na+ permeability is about 5% of the K+ permeability or even less, whereas the respective equilibrium potentials are +60 mV for sodium (ENa) and −90 mV for potassium (EK).
The membrane is permeable to K+ at rest because many channels are open. In a normal cell, Na+ permeability is about 5% of the K+ permeability or even less, whereas the respective equilibrium potentials are +60 mV for sodium (ENa) and −90 mV for potassium (EK).