Whether an increase in chloride permeability is hyperpolarizing or depolarizing depends on

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The effect of an increase in chloride permeability on a neuron's membrane potential depends on the relationship between the chloride equilibrium potential and the membrane potential. If the chloride equilibrium potential is more negative than the membrane potential, an increase in chloride permeability will hyperpolarize the cell. Conversely, if it is less negative (closer to the membrane potential or more positive), it could depolarize the cell.

Whether an Increase in Chloride Permeability Is Hyperpolarizing or Depolarizing