Q.

Which of the following cells secrete insulin?

A. Alpha cells
B. Delta cells
C. Nerve cells
D. Beta cells
Answer» D. Beta cells
Explanation: Insulin is a hormone that is exclusively produced by pancreatic beta cells. Beta cells are located in the pancreas in clusters known as the islets of Langerhans. When the beta cell is appropriately stimulated, insulin is secreted from the cell by exocytosis and diffuses into islet capillary blood.
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