It also secretes glucagon, which opposes the effects of another hormone it produces.  
This organ secretes somatostatin from its delta cells.  Some people have an extra part of this organ called the duct of Santorini.  Most of this organ's enzymes exit through the duct of Wirsung, after which they enter the common bile duct and into the duodenum.  It also secretes glucagon, which opposes the effects of another hormone it produces.  This organ contains the Islets of Langerhans, and its main function is disabled during diabetes.  For 10 points, name this organ, which is situated below the stomach and secretes insulin.
This organ secretes somatostatin from its delta cells.  Some people have an extra part of this organ called the duct of Santorini.  
Pancreas