Plz I need ur help quickly

[ahh86]

Hello
I have a problem with this question.

A fundamental property of cells is that the composition of the internal environment (intracellular) differs from the composition of the external environment (extracellular). Cells expend energy (in the form of ATP) to generate and maintain this difference (disequilibrium). The plasma membrane of cells (the boundary between the intracellular and extracellular environments) contains proteins that form water-filled channels (pores) and provide direct communication between the intracellular and extracellular environments.
What roles do channel proteins play in generating and maintaining the disequilibrium between intracellular and extracellular environments?
How is it possible for channel proteins to provide direct communication between the two environments and, at the same time, prevent the intracellular and extracellular components from mixing completely (which would collapse the disequilibrium between the two environments)?