在电生理学中,神经冲动及其传导的电学表现,叫做动作电位.单根神经纤维所产生的动作电位,反映出“全或无”定律,即动作电位不论以何种刺激方式产生,但刺激必须达到一定的阈值方能出现;阈下刺激不能引起任何反应——“无”;而阈上刺激则不论强度如何,一律引起同样的最大反应——“全”.神经纤维的这种“全或无”特性,对于传递信息 In electrophysiology, nerve impulses and their electrical conduction are called action potentials. The action potentials produced by a single nerve fiber reflect the “all or nothing” law, that is, the action potential is generated by whatever stimulus, but the stimulus It must reach a certain threshold before it can occur; subthreshold stimulation can not cause any response - “no”; and suprathreshold stimulation regardless of intensity, all cause the same maximum response - “all.” This “full” nerve fibers Or no "feature, for passing information