The liver cells are responsible for maintaining homeostasis of blood glucose levels. So let's suppose in our blood plasma, in our blood, we have a high concentration of glucose. The pancreas basically releases a hormone known as insulin. And insulin acts on the liver cells to cause those liver cells to absorb as much glucose as needed, to basically maintain a proper concentration of glucose inside the blood. So liver cells absorb the glucose and transform that glucose into the polymer form known as glycogen. Now, on the other hand, let's suppose our glucose concentration inside the blood is very low.