What is the threshold level needed to trigger an action potential in many neurons?
A)-70 mV
B)-55 mV
C)0 mV
D)+40 mV

Question

Quizplus · Accepted Answer

The threshold level needed to trigger an action potential in many neurons is approximately -55 mV, which is the point where the neuron's membrane potential (or resting potential) becomes depolarized enough to reach the action potential threshold. Once this threshold is reached, voltage-gated ion channels open, allowing a rapid influx of sodium ions and causing the membrane potential to spike upwards. Therefore, option B is the correct choice.

What Is the Threshold Level Needed to Trigger an Action