In the salamander, the sour taste receptor cells function by having an apically localized K+ channel that is blocked by protons. When protons are applied, what happens to the membrane potential and why?
A) Receptor depolarization because K+ permeability, which normally maintains a hyperpolarized resting state is reduced.
B) Receptor hyperpolarization because H+ ions move into the cell and render it more positively charged.
C) Receptor hyperpolarization because the H+ ions outside the cell make the inside of the cell more negatively charged.
D) Nothing will happen until the G-protein is activated.
Answer: A
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