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An involuntary response
A change in the environment that causes a response by stimulating receptor neurones
The Reflex Arc
The nerve pathway involved in a reflex response
First in the Reflex Arc
The stimulus is detected by receptor cells
Second in the Reflex Arc
The receptor starts an electrical impulse in the sensory neurone
Third in the Reflex Arc
The impulse travels through the sensory neurones into the spinal cord
Fourth in the Reflex Arc
Relay neurones in the spinal cord co-ordinate a response to the stimulus and send another electrial impulse to the motor neurones.
Fifth in the Reflex Arc
Motor Neurones send the message to the effectors
Sixth in the Reflex Arc
The response to the original stimulus occurs.