Which cells release insulin?

• A. Alpha cells
• B. Delta cells
• C. Beta cells
• D. Gamma cells

Answer: (C)

Insulin is produced by pancreatic beta cells, which are located in the islets of Langerhans in the pancreas. When blood glucose levels rise after a meal, these cells release insulin into the bloodstream. Insulin signals body tissues, especially muscle and fat, to take up glucose, and it promotes the liver to store glucose as glycogen. This coordinated action lowers blood sugar and helps cells use glucose for energy.

Alpha cells, on the other hand, release glucagon to raise blood glucose during fasting. Delta cells secrete somatostatin, which modulates digestion and hormone release. Gamma (PP) cells release pancreatic polypeptide, which influences pancreatic and gut functions. So, the cells that release insulin are the beta cells.