A human body is made up f number of cells. A nerve cell is defined as the cells of nervous system, which controls all types of body activities. The nerve cells are specialized cells, which transmits message from one part to another part of the body. All cellular organisms have evolved a coordinating system by which messages can be received and transmitted very rapidly to organs, enabling them to respond to an environmental change. The system which is responsible for this process is called as nervous system. The functional units of nervous system are nerve cell.
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