So the blood glucose levels are maintained at around a value of 5 million molar. That's the concentration. And the Km value of these two transporters is around 1 million molar. Now notice that first of all, it's lower than the five than the normal amount in our blood. And before we discuss what that actually means, let's remember what a Km value actually tells us. So the Km is simply the Mikhailus constant and the Km value basically tells us the concentration at which exactly half of the active size of that particular enzyme are actually filled.