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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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Regarding visual perception - choose the incorrect statement :


( A ) due to membrane permeability changes, potential differences are generated in the photoreceptor cells, which produces a signal that generates action potentials in the ganglion cells through the bipolar cells
( B ) light rays in visible wavelength focussed on the retina through the cornea and lens induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin which causes membrane permeability changes.
( C ) none of the above
( D ) photosensitive compounds (photopigments) in the human eyes is composed of opsin (a protein) and retinal (an aldehyde of vitamin A)
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1 Answer

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(C) is the right answer.

The light rays in visible wavelength focussed on the retina through the cornea and lens generate potentials (impulses) in rods and cones. As mentioned earlier, the photosensitive compounds (photopigments) in the human eyes is composed of opsin (a protein) and retinal (an aldehyde of vitamin A). Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin. This causes membrane permeability changes. As a result, potential differences are generated in the photoreceptor cells. This produces a signal that generates action potentials in the ganglion cells through the bipolar cells. These action potentials (impulses) are transmitted by the optic nerves to the visual cortex area of the brain, where the neural impulses are analysed and the image formed on the retina is recognised based on earlier memory and experience.
answered Apr 3, 2014 by pady_1
 
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