Now, what exactly is the mechanism by which our insulin actually controls our glucose? Well, basically, under normal conditions, what the insulin does is because it's a peptide hormone, that means it binds onto the membrane of target cells. So the receptor proteins for insulin are found on the plasma membrane of target cells, such as liver cells or muscle cells. And once our insulin actually binds onto the membrane, it makes the membrane more permeable to glucose. And that means glucose can now travel from the blood plasma and into the cytoplasm of the cell. And once inside the cell, the cell uses our glucose to basically store glucose in the form of glycogen.