A Threshold Stimulus is The

Question

A threshold stimulus is the
A) depolarization necessary to cause an action potential.
B) peak of an action potential.
C) hyperpolarization of an axon.
D) resting membrane potential.
E) electrical current that crosses the synaptic cleft.

Accepted Answer

A threshold stimulus is the depolarization necessary to cause an action potential. It is the minimum level of stimulus required to activate a neuron, typically between -55mV and -40mV. Once the threshold is reached, an action potential is triggered and propagated down the axon.