Role of Rod Cells and Cone Cells in Effecting Monochromatic and Trichromatic Vision
Retina contains 4 layers → synapse between them
Cone and rod cells (light-sensitive receptor) ...
Rod cells contain the protein rhodopsin and cone cells contain different proteins for each color-range.
The electron micrograph (courtesy of Keith Porter) shows the rod cells of the kangaroo rat. The outer segments of the rods contain the orderly stacks of membranes which incorporate rhodopsin. The inner portion contain many mitochondria.
Cgmp-gated calcium channel A channel in rod cells that opens in response to cgmp to allow entry of calcium and sodium ions into the cell; closing of the channel in response to cgmp hydrolysis initiates the visual signal-transduction pathway.
cone A vertebrate photoreceptor cell with a tapered outer segment; unlike rod cells, cone cells are usually sensitive
cone cell A color-sensitive photoreceptor cell concentrated in the retina.
RP is an inherited condition of the retina in which specific photoreceptor cells, called rods, degenerate. The loss of function of these rod cells diminishes a persons ability to see in dim light and gradually can reduce peripheral vision as well.
 See also: Receptor, Cell, Brain, Membrane, Human
  
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