[12][15] The retina contains the photosensitive rod and cone cells and associated neurons. To maximise vision and light absorption, the retina is a relatively smooth (but curved) layer.
opsins Molecules in cone cells that bind to pigments, creating a complex that is sensitive to light of a given wavelength.
orders Taxonomic subcategories of classes. PICTURE ...
a small, pitlike area in the optic center of the eye's retina; only cone cells are present and their stimulation leads to acute vision
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...
rod A class of vertebrate photoreceptors that, unlike cone cells, is usually insensitive to color.
Romana's sign Symptoms of recent infection by Trypanosoma cruzi, consisting of edema of the orbit and swelling of the preauricular lymph node.
Opsins are chemicals that bind to cone cells and make those cells sensitive to light of a particular wavelength (or color). Humans have three different form of opsins coded for by three genes on the X chromosome.
 See also: Cells, Vision, Cell, Membrane, Animal
|
