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Insulin is secreted by:

AAlpha cells of pancreas
BLiver
CBeta cells of pancreatic islets of Langerhans
DAcinar cells
Answer & Solution
Correct answer: C. Beta cells of pancreatic islets of Langerhans
Islets of Langerhans (endocrine pancreas, ~2% of pancreatic mass) contain: α cells (glucagon), β cells (insulin), δ cells (somatostatin), F/PP cells (pancreatic polypeptide). Acinar cells are exocrine (digestive enzymes).
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