So let's imagine that our body is undergoing starvation. And so what that means is in our blood plasma we have a relatively low concentration of glucose. And to basically increase the level of glucose, the liver cells have to begin breaking down the glycogen into glucose and release that glucose into the blood plasma. So how exactly does this process actually take place? This is what we call the glucagon signal transduction pathway. So let's take a look at the following diagram which basically outlines this complicated process.