CIE IGCSE Biology: 复习笔记：14.1.5 Sense Organs

• 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

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