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Trace the sequence of events that occur when a bright light is focused on your eyes.
When a bright light is focused on our eye, the receptor cell receives the message and passes it on to the sensory neuron, then it goes to the brain, the brain reverts back the message by motor neuron which contracts the pupil.
The sequence of events that occur is:
$Receptor\rightarrow Sensory\ neuron\rightarrow Brain\rightarrow Motor\ neuron\rightarrow Eye\rightarrow Eye\ muscle\ contracts$.
Extra Information
Irises are the coloured part of our eye (typically brown or blue), which helps to protect the retinas of our eyes from damage by bright light by contracting the pupil to accommodate the right amount of light inside the eye.
It consists of two sets of smooth muscles that control the diameter and shape of the pupil, and they are:
1. Sphincter muscle - These muscles are in the shape of a ring located at the edge of the pupil and cause the iris to constrict or contract, reducing the size of the pupil.
If the light is bright, the size of the Pupil gets reduced (smaller), so that less amount of light can enter the eyes.
2. Dilator muscle - These muscles are in the radial shape located radially throughout the iris, like spokes on a wheel, and cause the iris to dilates or stretch, increasing the size of the pupil.
If the light is dim, the size of the Pupil gets increases (larger), so that more amount of light can enter the eyes.
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