The Nervous System and Reflexes

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The Nervous System

STIMULUS – a change in environment

RECEPTOR – detects the change in environment

SENSORY NEURONE – relays message to the CNS

CNS (Central Nervous System) – coordinates a response and consists of the brain and spinal cord

(RELAY NEURONE – only used in reflexes. In the CNS, the sensory neurone relays the impulse to the relay neurone which then passes it on to the motor neurone)

MOTOR NEURONE – relays the response to the effector

EFFECTOR – brings about a response to stimuli…


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