Eyes G protein chain
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6 Terms
1
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Step 1
Retinal absorbs light and changes shape. Visual pigment activates
2
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Step 2
Visual pigment activates transduction (g protein)
3
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Step 3
Transduction activates phosphodiesterase
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Step 4
PDE converts cGMP to GMP, causing cGMP levels to fall
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Step 5
As cGMP levels fall, cGMP-gated cation channels close, resulting in hyperpolarization
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In the dark
cGMP-gated channels open, resulting in depolarization
Note 
Flashcards (61)