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Vision-2 - Statistics

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  • This quiz has been taken 2 times
  • The average score is 1 of 15
Answer Stats
Hint Answer % Correct
What is the name for the central part of the retina in which there are no rods or blood vessels? Foveola
100%
What vitamin is retinal a derivative of? A
0%
What metals cation is believed to be the major mediator in photoreceptor adaptation? Ca
0%
What molecule is reduced in concentration (in rod cells) when light is present, leading to closure of channels? cGMP
0%
Which of rods and cones has invaginating lamellae instead of stacked membranous disks? Cone
0%
What enzyme is inhibited by this cation, that recycles molecules required for recognition of light? Guanylyl cyclase
0%
When there is more light is there more or less of the cation inside the cell? Less
0%
What is the catalytically active form of this pigment that arises when absorption of a photon changes the molecule from 11-cis to all-trans retinal? Metarhodopsin II
0%
For cones what type of cell is used as an alternative pathway so that pigment is rapidly regenerated? Muller
0%
What part of the retina may appear larger with increased intracranial pressure? Opitcal disk
0%
What enzyme is used to alter this molecule? Phosphodiesterase/PDE
0%
What is the name of the disease where someone had no red cones? Protanopia
0%
Once the pigment is bleached it must be regenerated, this can only occur outside the photoreceptor but where specifically? Retinal Pigment Epithelium/RPE
0%
Which photopigment is found in rod cells? Rhodopsin
0%
What is the name for the disease where someone has no blue cones? Tritanopia
0%
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