What change in a membrane potential triggers an action potential?

depolarization

A nerve is crushed between the two recording electrodes.

The membrane potential must depolarize from the resting voltage of -70 mV to a threshold value of -55 mV.

The electrical potential of the cell body changes during an action potential from a negative potential of around -70 mV to a positive potential of +40 mV. The resting potential, however, remains...

The resting potential is the neuron "normal" state. The resting potential is around -70 millivolts (mV). An action potential is generated when membrain is depolarization to the threshold value. The...