Question

When the membrane is at the potassium equilibrium potential, in which direction (in or out) is there a net movement of potassium ions?

Answer 1

• The balance between the chemical and electrical forces pushing potassium through potassium channels and across the membrane is represented by the potassium equilibrium potential.
• At the equilibrium potential of potassium, which is -80mV, there is no net movement of potassium ions.

At potassium's equilibrium potential, what happens?

• At equilibrium, the electrical potential gradient across the membrane precisely balances the gradient of K+ concentration.
• There is no net migration of K+ from one side to the other, despite the fact that K+ ions continue to traverse the membrane via channels.

How does potassium diffuse in order to influence the membrane potential?

• Potassium ions will flow down their concentration gradient, or towards the exterior of the cell, because the membrane is permeable to them.
• Although the membrane is not permeable to sodium, there is a concentration gradient that favors sodium diffusion in the opposite direction.

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