But the major difference between the carbon dioxide and the bicarbonate is the bicarbonate contains a full negative charge. And that makes this molecule polar. And what that means is if the molecule moves into the blood plasma, it will have no problem dissolving in the polar blood plasma. And so what happens is the bicarbonate ions, about 85% of the initial carbon dioxide that entered this blood plasma exists in the form of the bicarbonate ions. So a special protein membrane in a cell, in the membrane in the red blood cell transports these bicarbonate ions into the blood plasma. Now, at the same time, this transport protein also pumps these chloride ions into the red blood cell.