So we have the liver cells and skeleton muscle cells and the glycogen molecules, the glycogen polymers are actually stored in these tiny granules found throughout the cytoplasm of the liver and the skeleton muscle cells. So this is basically what glycogen actually looks like. And as I mentioned before, the liver cells use the glycogen primarily to actually regulate and maintain the proper levels of glucose inside our blood, while the skeleton muscle cells actually use the glycogen to break it down to glucose, to use it as a rapid energy source for sudden and strain use activity. Now, in the lectures to come, we're going to discuss glycogen metabolism and we can break down glycogen metabolism into subcategories. So we have the degradation of glycogen, so the breakdown of glycogen, and we also have the synthesis of glycogen. Now, if we examine the breakdown of glycogen, the degradation of glycogen, we can actually categorize that process into three different steps.