We have the hepatitis, the liver cells, and we also have the skeleton muscle cells. Now, cells such as our liver cells are responsible for actually regulating and maintaining the glucose levels inside our blood. Now, why is it important to maintain a proper glucose level inside our blood? Well, one reason is because cells such as our brain cells depend solely and almost entirely on glucose molecules for energy. And so what that means is the brain cells need to take the glucose from the blood to actually use the glucose as an energy source. And that's why the liver must actually maintain and regulate the proper concentration of glucose inside our blood.