If the stimulus is large enough at the trigger zone, the membrane potential reaches ____, and an action potential begins.
A)a positive charge
B)maximum voltage
C)resting potential
D)threshold potential
E)zero

Question

Quizplus · Accepted Answer

The threshold potential is the membrane potential at which an action potential is initiated. If the stimulus is large enough at the trigger zone to reach the threshold potential, an action potential will begin. Thus, option D is the correct answer.

If the Stimulus Is Large Enough at the Trigger Zone