The blood level of glucose basically increases. Our liver wants to maintain that and decrease it back to normal. So the liver cells uptake the glucose molecules to trap the glucose within the cell and to prevent it from leaving the cell, they use hexacionase and an ATP to form glucose six phosphate. Next, the glucose six phosphate is transformed into glucose one phosphate by the activity of phosphor glucom Utase. Now, once we form the glucose one phosphate, we want to activate the molecule, make it much more reactive and increase its energy. And so what we do is we use UDP glucose pyrophosphorylase to basically transfer a group from UTP onto the glucose one phosphate and that kicks off a Pyrophosphate, as shown in this diagram.