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Human Body
areas irritability or reponsiveness to stimuli and conductivity, the ability to transmit impulses. The cell unit of nerve tissue are called neurons. They extend to almost every region of the body. They differ somewhat in structure and ranging in size from a few thousandths of an inch to several feet long. However, each one is composed of a cell body, an extension called the axon which carries impulses away from the cell body and several processes called dendrites which carry impulses to the cell body.
In addition to the neurons, nerve tissue includes interstial cells, the neuroglia, which support and nourish the neurons. We shall discuss the intricate method of the transmission and impulses by the nerves in the section 'Nervous System'.
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