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.
Branching is not uncommon, with most axons having at least one axon branch and others having many, even hundreds of branches from the main axon. At the terminal end of an axon or an axon branch, the electrical impulse is then passed to another nerve cell via the dendrites or to or from another type of cell. Ad.t the terminal end of an axon or an axon branch, the electrical impulse is then passed to another nerve cell via the dendrites or to or from another type of cell. Ad.