Question

Trace the sequence of event which occur when a bright light is focussed on our eyes

Answer 1

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Light focussed on eyes - Stimulus sensed and received by receptors in the eyes - sensory nerves take the stimulus in form of impulse to the spinal cord - Decision taken by spinal cord - stimulus transferred to motor neurons from the spinal cord to the eye muscles - Muscles contract - eyes respond by blinking and shutting eyes.

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Answer 2

when the bright light falls on the eye,the light receptors in the eye produce impulses in the sensory nerves. the sensory nerves carry this message of bright light in the form of electrical impulses to the brain. the brain produces the response. the response produced by the brain is carried by the motor nerves to the circular muscles of the iris of the eye. the circular muscles of the iris of the eye contract and reduce the size of the pupil of the eye. as the size of the pupil becomes smaller, the amount of light entering the eye is reduced.
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