Can you now trace the sequence of events which occur when a bright light is focussed on your eyes?
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When bright light is focused on our eyes , the photoreceptors present in our eyes generate electric impulses and send it to the spinal cord via the sensory neurons. The spinal cord inteprets the message and send its response to the muscles of the eyelids to close via the motor neurons. Therefore, our eyelids close when bright light is focused on our eyes.
Receptor —> Sensory neuron —> Brain —> Motor neuron —> Eye —> Eye muscle contracts.
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When a bright light is focussed on eye, receptor cell receives the message and passes on to sensory neuron, then it goes to brain, brain reverts back the message by motor neuron which contracts the pupil.
Receptor —> Sensory neuron —> Brain —> Motor neuron —> Eye —> Eye muscle contracts.
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