The Equilibrium Potential of K⁺ Ions in Nerve Cells Is

question 96

Multiple Choice

The equilibrium potential of K⁺ ions in nerve cells is about -90 mV. The membrane potential of typical nerve cells at rest is -70 mV. Therefore

• A) Increasing the permeability of a resting neuronal membrane to K⁺ will make the membrane potential more negative inside with respect to outside.
• B) In resting neurons, there is a net diffusion of K⁺ into the cell.
• C) changing the resting membrane potential of a neuron to -80 mV would increase K⁺ diffusion rate out of the cell.
• D) potassium is the only permanent ion at rest.
• E) there must be another permanent ion with an equilibrium potential more negative than -90 mV.

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