And so these two forces point an equal and opposite direction. So they're equal in magnitude, they point in opposite directions. And so this marker is not going to move in the same way that the sodium ion is not going to move because of the presence of the hydrophobic barrier. 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.