The membrane voltage level at which an action potential is triggered is termed the

The threshold potential. The value can vary bfrom - 90mV to - 70mV to - 50mV based on several factors. It is the level at which a membrane potential must be achieved (depolarization) in order to initiate an action potential. This means that when a signal is transmitted, it is either strong enough to reach and exceed this value in order to generate a response (action potential) or it is too weak to reach this value, thus no response is generated (no action potential).