PATHOLOGY

A 44-year-old woman comes to the physician with a6-week history of episodic hunger and fainting spells.She is currently seeing a psychiatrist because she is irri-table and quarreling with her family. Laboratory studiesshow a serum glucose concentration of 35 mg/dL (nor-mal = 90 mg/dL). A CT scan of the abdomen demon-strates a 1.5-cm mass in the pancreas. An EM study ofthe tumor reveals membrane-bound, dense-core gran-ules. These secretory vesicles most likely contain whichof the following pancreatic hormones?