An all-or-none response pattern is characteristic of the
A) activation of either the sympathetic or the parasympathetic system.
B) release of endorphins into the central nervous system.
C) release of hormones into the bloodstream.
D) initiation of neural impulses.

Question

Quizplus · Accepted Answer

An all-or-none response pattern refers to the fact that a neuron will either fire an action potential or not. Once the threshold for firing is reached, the action potential is initiated and travels down the axon at a consistent amplitude, regardless of the strength of the stimulus. This is a characteristic of neural impulses. The other options (activation of either the sympathetic or parasympathetic system, release of endorphins, release of hormones) do not necessarily exhibit an all-or-none response pattern.

An All-Or-None Response Pattern Is Characteristic of the