Weegy: The pancreas is composed of two types of functional tissue: groups of cells termed the islets of Langerhans and ducts called the pancreatic acini. The islets of Langerhans are the portion of the pancreas that manufactures and secretes hormones. [ [ The pancreatic acini make and secrete the pancreatic enzymes as well as bicarbonate ions used to neutralize stomach acids. ]
(More)