It also raises the concentration of blood sugar by promoting the breakdown of glycogen, in essence opposing the action of insulin.  
This hormone promotes the breakdown of protein and the metabolism of fat in the body. It also raises the concentration of blood sugar by promoting the breakdown of glycogen, in essence opposing the action of insulin.  It is produced in two distinct forms, one of which is gastrointestinal.  For 10 points, name this pancreatic hormone produced in the islets of Langerhans.
This hormone promotes the breakdown of protein and the metabolism of fat in the body.
glucagon