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Insulin is produced by the Islets of Langerhans in the pancreas.

These are cells scattered throughout the pancreas, about a million of them in a healthy adult.

Their are five different types of these cells.

  • There are alpha cells which produce glucagon (it breaks glycogen down into blood sugar (glucose) when the blood sugar levels are low.
  • Beta cells, which produce insulin (it aids the bodies cells in absorbing the blood glucose)
  • Delta cells, which produce somatostatin, a tropic hormone (basically the off switch to the alpha and beta cells)
  • PP Cells, Polypeptide cells of unknown importance
  • D1 cells, or Epsilon Cells, which produce ghrelin (the hormone that tells your brain it's time to eat.) It is the on switch where the hormone, leptin is the "I'm Hungry" off switch.
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