Control and Coordination — BIOLOGY STD 8 — Question

The basic structural unit of the nervous system is a nerve cell or a neutron. The message that travels along a neutron is called an impulse. It is like an electrical signal. Each nerve cell consists of a cell body called cyton. The cell body contains the nucleus. Many short fibres called dendrons extend from the cell body which further divide to form dendrites. They receive messages from other neurons. A single long fibre called axon extends from the other side of the cell. Axon carries the message from the cell body of one neuron to another. The axon is covered by a sheath called myelin sheath.