Biology / Unit 12 Bio 2821 short lesson, about 20 seconds
Resting Membrane Potential
Captions available
The idea
A resting neuron holds its interior near −70 millivolts relative to its exterior, maintained by more potassium leak channels than sodium and by the pump, per Bio 0362.
In practice
Potassium ions leak out of the resting cell faster than sodium leaks in, leaving the interior negative.
Where people slip
The exact resting value varies by neuron and species — the mechanism, not the number, is stable.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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