Biological Bases Of Behavior Practice Test

What describes the level of stimulation required to trigger a neural impulse?

Refractory period Threshold Aphasia Endocrine system

Correct Answer:

Threshold

Explanation:

Threshold is the minimum stimulation needed to trigger an action potential. When a neuron’s membrane potential reaches this level, voltage-gated ion channels open and an all-or-none spike is produced. Subthreshold stimuli don’t reach that point and fail to fire. Stronger stimuli beyond threshold don’t make the spike taller—the action potential has a consistent size; instead, they can increase the firing rate or recruit more neurons to convey stronger signals. The refractory period describes a brief recovery window after firing, not the trigger level. Aphasia is a language impairment, and the endocrine system deals with hormones, not the initiation of neural impulses.

Access more questions from this quiz

Continue to Biological Bases of Behavior Practice Test for more practice questions and the full quiz experience.

Access More Questions