In the Salamander,the Sour Taste Receptor Cells Function by Having

question 64

Multiple Choice

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.

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