The basil lateral side of the cell is the side that points that faces our basement membrane, found in the interstituum of the surrounding thick loop of Henley. So this membrane contains sodium, potassium, Atpas pumps, and these utilize ATP molecules, energy molecules to basically move sodium ions against their electrochemical gradient. So three sodium ions are basically pumped from the inside of the cell to the outside of the cell. At the same time, two potassium ions are pumped from the outside to the inside of the cell. And what this ultimately does is it establishes a gradient for sodium. So inside the cell, we have less sodium than on the outside.