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Visual Pigments

  • M. A. Ali
  • M. A. Klyne

Abstract

Light is able to stimulate directly the radial net of the sea urchin; but in vertebrates light has no effect on the optic nerve. In order to trigger the discharges in the optic nerve there must be a light-sensitive mediating mechanism. In the vertebrate eye this is achieved by the photostimulation of the visual pigments. Rhod-opsin when photostimulated undergoes a series of spontaneous reactions which ultimately results in stable products. These sequences of events do not require enzymatic or metabolic energy. On the other hand, the regeneration of the visual pigment from the product of reaction is energy consuming. The photoactivation and regeneration of the visual pigment, termed the visual cycle (Wald, 1935) is illustrated in Fig. 3.1.

Keywords

Outer Segment Difference Spectrum Visual Pigment Disc Membrane Photoreceptor Outer Segment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • M. A. Ali
    • 1
  • M. A. Klyne
    • 1
  1. 1.Université de MontréalMontrealCanada

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