Question

Why at resting potential axonal membrane is more permeable to pottasium?

Answer 1

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Opening and closing ion channels alters the membrane potential. In a neuron, the resting membrane potential is closer to the potassium equilibrium potential than it is to the sodium equilibrium potential. That's because the resting membrane is much more permeable to K + \text K^+ K+ than to Na + \text {Na}^+ Na+.