E.1 Reflexes

pg. 321

stimulus: a change in the environment, either internal or external, that is detected by a receptor and elicits a response
response: a change in the organism, produced by a stimulus
reflex: a rapid unconscious response to a stimulus
pain withdrawal reflex: co-ordinated by the spinal cord (reflex arc)

reflex arc:
– pain receptors detect the pain
– sensory neurons carry impulse
– synapses with relay neurons
– relay neurons have synapses with motor neurons
– muscle contract (motor neurons to muscle fibres)


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