Membrane resting potential is -70 mV ( millivolts ) . Threshold value is -50 mV . Threshold value is the lowest level of stimulus that will trigger an action potential ( nerve impulse ) . During hyperpolarisation , the inside membrane of axon becomes more negative which is below -70 mV to about -80 mV . When after-hyperpolarisation or undershoot , the resting potential value ( -70 mV) of membrane axon is re-establish .
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