Question

Consider an experimental set-up with two fluid-filled chambers that are separated by a plasma membrane with open K channels but no other ion permeability. If you were to add 100 mM of NaCl into side 1 and 100 mM of KCl into side 2, what would you expect to happen

Answer 1

Answer: K+ will flow from side 2 to side 1 until it is in equal concentrations in the two compartments

Explanation: A membrane potential will develop so that the electrical gradient stops the movement of K+ before equilibrium of the concentration can occur