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The nerve cell is the fundamental unit of the nervous system. 1_______. Typically, a nerve cell looks like an octopus.
It has a central cell body from which tentacles extend. 2_______. The other tentacles or fibers receive impulses and carry them to the cell body; they are called dendrites.
3_______. Like telephone wires running underground, they form a kind of cable, which is enclosed in a flexible tube of connective tissue. This whole cable of nerve fibers is what we ordinarily call a nerve.
4_______. The nerve fibers growing out from them will regenerate, though slowly.
Nerve cells vary greatly in size and shape
One of these extensions carries impulses away from the cell body; it is called the axon
Axons and dendrites form nerve pathways
Nerve cells have the serious disadvantage of not being able to regenerate once they are destroyed