ALL-OR

Difference of charges across the plasma membrane • Resting potential - Resting cells are (-) inside and (+) outside - Large amounts of Na+ outside the cell and K+ inside • Action potential / impulse - Rapid reversals in charges across the plasma membrane - Caused by the exchange of ions across the membrane of the neuron - Threshold level (- 55mV) needed to stimulate neurons ALL-OR - NONE principle

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