what is the main service of nervious system?

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orchid101 | College Teacher | (Level 1) Associate Educator

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All multicellular animals contain elongated nerve cells, called neurons, collected together into parallel bundles called nerve trunks. Every nerve trunk contains thousands of neurons. It is clear that these control the movements of muscles (via motor nerves) and the conduction of information from the sense organs to the central nervous system (via sensory nerves). Each neuron has a cell body , called the neurocyton, 4 to 25 microns in diameter, containing a nucleus and cytoplasm much like that of other cells. The entire nervous activity is based on reflexes, the functional units of the nervous system.