Now we'll see why that's important. In just a moment. The first question that I basically want to ask is the following what exactly is it about this ion channel that gives it the property we call ion specificity? So ion specificity is the ability of the ion channel. In this case, it's the potassium ion channel to basically move specific ions. In this case, it's the potassium ions across the cell membrane, while at the same time preventing the movement of all other ions.