It's too large and it's too polar. So instead, what our cell membrane does is it uses a special type of protein and integral protein that basically allows the glucose to move from a high electropotential gradient to a low electric potential gradient. So down the electropotential gradient. And so in this case, we do not use any type of energy. But in the case of active transport, as we describe in section three, we basically use we expend an ATP molecule to basically move our sodium as well as the potassium, which normally cannot move through the phospholipid bilier because they have positive charge. We use this type of integral protein to basically move these molecules against our electrochemical gradient.