Quiz 2: Visual System
 Be sure to not only answer the questions but rank them from most appropriate and well written (10 ) to least appropriate and/or badly written (1).  In the section where you choose one of two questions only rank the one that you've chosen.  In total you should have 10 questions that you rank.

1. Rhodopsin is composed of ___________ and _____________.
2. True/False  The eye of the musk Nautilus uses a pinhole to focus images on the retina.
3. Complex cells, located in the visual cortex, respond to:
   a. light only in certain areas of visual field
   b. movement
   c. color
   d. stimulus (light) orientation
   e. form/shape
4. What is the most  basic function of a photosensitive cell?
   a. to distinguish  shape and form
   b.to  determine distance  and relative size of an object
   c.to  detect  movement
   d.to  distinguish light from dark(answer)
5. What is the difference between the retinal ganglion cells: parvocellular(X) and magnocellular (Y)?  And in what species are these cells denoted by X and Y?
6. Which type of retinal ganglion cells are concentrated in the fovea region of the retina, and what role does this play in vision?
7. What  do the horizontal cells do and how do they differ from amacrine cells?
8. In mammals, where is the primary thalamic projection of the optic tract and how are the inputs from each eye segregated within this structure?
9. Describe the role of g-proteins in the transduction of the visual signal to a neural signal.
10. A 36 year old woman visited an ophthamologist because she was having trouble with her eyesight. She could not see objects off to the side, but could when they were directly in front of her. What would be the most parsimonious explanation for these symptoms?