The nervous system is made up of a complex network of cells called neurones. These are the three main types:
Sensory Neurones : Transmit electrical impulses from receptors to the central nervous system (CNS) - the brain and spinal cord.
Motor Neurones: Transmit electrical impulses from the CNS to effectors
Relay Neurones: Trasmit electrical impulses between sensory neurones and motor neurones.
A stimulus is detected by receptor cells and an electrical impulse is sent along a sensory neurone.
When an electrical impulse reaches the end of a neurone, chemicals called neurotransmitters take the information across to the next neurone, which then sends an electrical impulse. The CNS (the coordinator) proscesses the information and sends impulses along motor neurones to an effector.
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