Answer:
Neurons or nerve cells
are the units which make up the nervous system. These are the structural and
functional unit of the nervous system. It is the largest cell in the body. It carry
messages over large distance in the body quickly. The messages are in the form
of electrical signals called electrical impulses or nerve impulses.
A neuron is shown in
figure below
A neuron (or
nerve ceil} has three components
(i) Cell
body It contains cytoplasm and a nucleus
(ii)Dendrites
These are shorter fibres on the body of a neuron.
(iii)Axon
The longest fibre on cell body of a neuron.
The axon has
an insulating and protective sheath of myelin around it. A number of long and thin
fibres stretch out from the cell body of a neuron called nerve fibres.
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