Question

endocrine pancreas
which pancreatic cells release insulin and glucagon?
pancreatic islets
chromaffin cells
chief cells
acinar cells

Explanation:

Pancreatic islets (islets of Langerhans) contain beta cells (release insulin) and alpha cells (release glucagon). Chromaffin cells are related to adrenal medulla. Chief cells (e.g., in stomach secrete pepsinogen). Acinar cells in pancreas are exocrine (secrete digestive enzymes).

Answer:

Pancreatic islets