• Receptors are groups of specialised cells
• They?detect a change in the environment and stimulate electrical impulses in response
• Sense organs contain?groups of receptors?that respond to specific stimuli

• Once the receptor cell in the sense organ has been stimulated, it generates an?electrical impulse
• This is passed on to a?sensory neurone?which carries the impulse to the?central nervous system
• Here a response will be decided on and the impulse will be passed to a?motor neurone?(via a relay neurone)
• The motor neurone carries the impulse to the?effector?(muscle or gland)
• The effector?carries out the response

轉載自savemyexams