when light is shone into your eye your pupils go big to let less light in
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describe the 1st stage of the nervous system
the stimulus is detected by a receptor, impulses are sent along a a sensory neurone
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2nd stage of the nervous system
impulses reach a synapse between the sensory and relay neurone, they trigger chemicals to be sent across, causing impulses to be sent along the relay neurone
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3rd stage
when the relay reaches a synapse between the relay and motor neurone chemicals are passed along again
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4th stage
the impulses travel to the effector
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5th
the muscle contracts to move away from the stimulus
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