The functional unit is the islet of Langerhans. There are about one million islets, comprising about 1 %-1.5 % of the total pancreatic mass and weighing about 1-2 grams in the adult. The islets of Langerhans comprise: Alpha cells: glucagon.
5 Beta cells: insulin. These cells comprise 70%-80% of the cell population of the d c islets. i g Delta cells: somatostatin; gastrin.
y Pancreatic polypeptide cells: pancreatic polypeptide.
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