That sodium, because it contains a full positive charge, it cannot dissolve in the non polar hydrophobic core. So what these membrane channels do is they essentially create a passageway in that membrane that basically doesn't contain that hydrophobic core. And what that means is what that channel does is it removes that hydrophobic core so that now that marker can move down its gravitational potential in the same way that the channel creates this passageway that doesn't contain the hydrophobic regions anymore. And so now it moves down its potential gradient. So we essentially remove that force that existed due to these hydrophobic regions. Remove that force, we only have the electric force.