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Chapter 9: The Eye (Gross anatomy of the eye (Lens- divides eye into two…

- - - - Most cones are in fovea- no rods
      - Low ratio of photoreceptors to ganglion cells
- - - - Rods: long, cylindrical outer segment with many disks-- All contain rhodopsin
      - Cones: Shorter, tapering outer segment with fewer disks-- 3 types, each with different pigment
- - - - Produces activation of transducin (G-protein)
        
        α- subunit of transducin activates phosphodiesterase, which hydrolyzes (reduces concentration of) cGMP; Na+ can't get in
  - - - Red (long wavelength), Green (Medium wavelength), Blue (Short Wavelength)