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22.docx - Gulbit The visual purple, also known as...

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GulbitThe visual purple, also known as rhodopsin, is a protein composed of a chromoprotein called an opsin that isanchored to a chromatophore molecule. This gives it the ability to absorb light in the visible part of thespectrum. A chromatophore is absent, since the protein is absorbent only in the ultraviolet. Without such achromatophore, the protein appears colorless to the eye. Vitamin A gives rise to the chromatophore community,and prolonged exposure of the eye to light produces free retinal in the retina. The eyes have a built-in repairsystem in the absence of light, which joins retinal and opsin to regenerate rhodopsin. This statement isequivalent to: rhodopsinretinal+opsin.This photochemical alteration that occurs in the retina induces the illusion of light. If a steady state is achievedat a given light intensity with the regenerative process keeping pace with the photochemical bleaching, theprocess is reversed by a thermal—i.e., non-photochemical—reaction. The dark adaptation or regenerativeprocess can be referred to as an aspect. There is reason to believe that the electrical transition in the rod thatultimately evokes the feeling of light takes place prior to the retinal breaking off. For example, in the phase that

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Term
Spring
Professor
N/A
Tags
Chemistry, Photoreceptor cell, rhodopsin

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