Which of the following best describes the permeability to sodium and potassium in rod cells in response to the light?
Correct Answer: Decreased sodium permeability, no change in potassium permeability
Description: Activated rhodopsin (metarhodopsin II) closes cGMP-gated sodium channels by lowering levels of cGMP; this action decreases sodium permeability. Potassium permeability is not affected.
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Physiology
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