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