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Get Answers to all your Questions
Q6. Give a brief account of:
(b) Mechanism of vision
Answers (1)
- The light rays pass through the pupil, lens, aqueous humour, vitreous humour and falls on the retina.
- The light induces the dissociation of the photo-pigment rhodopsin into opsin and retinal.
- The dissociation of opsin from the retinal brings changes in the structure of opsin.
- This generates an action potential in the rods and cones of the retina.
- The action potential is further transmitted to the ganglion cells through bipolar neurons.
- It is finally transmitted to the visual cortex of the brain via the optic nerve.
- The impulses are analysed at the visual cortex and the responses are sent back to form the image on the retina.
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