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. In this case, the pancreas releases a hormone known as glucagon. And glucagon acts on liver cells and it causes, it stimulates those liver cells to break down glycogen into glucose and release that glucose into that blood, maintaining a proper level of glucose inside the blood. On top of that, it also stimulates our liver cells to undergo process known as gluconeogenesis.