Now, the fact that our glucagon is a peptide hormone also means it is not lipid soluble. And that means it cannot actually pass across the cell membrane. So what glucagon does is it finds the target cell, which is usually the cell inside the liver, known as the liver cells. It binds onto the membrane of that liver cell and it initiates a secondary message system. And what it basically does is it causes our liver cells to break down glycogen. Glycogen is the polymer that consists of glucose molecules.