Nervous+system+poject


 * Photo Receptor Cells

Photo receptors are specialized neurons that absorb photons, enabling you to see. These neurons are found in the part of the eye called the retena

Types of photo receptors Cons Rods The main purpose of cone cells is to help the eyes detect colors. Cones detect colors the best in bright light.

Rods are slightly more sensitive than Cones. They dont detect color but they work well in low lighting situations

The average human eye contains 6 million Cones 120 million Rods

Rods also detect dept,color and intensity

Cones respond to the intensity of wavelengths so it takes more than one cone cell to detect color. Rods however are quite sensitive, one rod is capeable of detecting one photon of light unike cones

http://www.fz-juelich.de/inb/inb-1/datapool/page/24/Figure2.jpg

http://thebrain.mcgill.ca/flash/d/d_02/d_02_m/d_02_m_vis/d_02_m_vis_1a.jpg

http://en.wikipedia.org/wiki/Image:Cone-response.svg