So we see that when blood glucose levels are high, the glucokinates make sure that the liver cells transform that glucose into glycogen and fatty acids and other building blocks, so that all those glucose molecules are removed from the blood. Now, that's the first important reason why we have gluco kinase in liver cells and we don't have in muscle cells, because muscle cells, the function of muscle cells is to simply move our, create voluntary motion. But liver cells have a much more diverse biochemical role. Now, the other reason, well, what happens when the blood glucose level is low? So let's suppose we're essentially starving. So we haven't eaten for, let's say, a week, and we essentially want to eat.