A columnist is someone who writes for publication in a series, creating an article that usually offers commentary and opinions. Columns appear in newspapers, magazines and other publications, including blogs. They take the form of a short essay by a specific writer who offers a personal point of view.
This positive spike constitutes the action potential: the electrical signal that typically moves from the cell body dlown the axon to the axon terminals. The electrical signal moves down the axon like a wave; at each 84 Ch apter 3 Biopsycholo gy point, some of the sodium ions that enter the cell diffuse to the neJ1.'t section of the axon, raising the charge past the threshold of excitation and triggering a new influx of sodium ions.
Best Answer: An action potential is an electrical signal that travels from one part of a nerve cell to another. The action potential begins at the soma or cell body. It then travels down the axon (this might be as long as 1 meter in some cases). At the nerve terminal (the end of the axon), the action potential stops. But, it triggers a chemical signal (neurotransmitter) to be released across the synapse (the gap between two nerve cells or a nerve cell and a muscle cell).