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**δ cells produce somatostatin. Low numbers in all islets.
 
**δ cells produce somatostatin. Low numbers in all islets.
 
**F cells produce pancreatic polypeptide
 
**F cells produce pancreatic polypeptide
**Glucagon raises the blood glucose level.
+
*Glucagon raises the blood glucose level.
**Insulin decreses the blood glucose level.
+
*Insulin decreses the blood glucose level.
**Somatostatin acts in a paracrine fashion to inhibit both glucagon and insulin secretion.
+
*Somatostatin acts in a paracrine fashion to inhibit both glucagon and insulin secretion.
**Pancreatic polypeptide is thought to be a cholecystokinin antagonist, and thus inhibits secretion of pancreatic juice.
+
*Pancreatic polypeptide is thought to be a cholecystokinin antagonist, and thus inhibits secretion of pancreatic juice.
    
===Glucagon===
 
===Glucagon===
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