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Section A

Section B

Section C

Section D



Figure 32a. A typical nerve impulse (action potential). The hyperpolarization phase after the impulse is called "afterhyperpolarization". [Source: Wikipedia]

Nerve impulses, also known as "action potentials", are the foundation of information transmission within the nervous system, which consists of two classes of cells: neurons and neuroglial cell (glia). Through nerve impulses, neurons can transmit signals from sensory systems and cooperate with muscle cells to produce movement response. In general, glia can not produce nerve impulses, although researchers have found a few exceptions. However, there is a type of glia, called astrocytes, which can release neurotransmitters and directly participate in signal transmission.

A. Structures of Neurons

B. Nerve Cell Membrane

C. The Generation of Nerve Impulses

D. The Propagation of Nerve Impulses


Author: Frank Lee
Posted on: 2020-08-25