Exocrine pancreatic ducts are easy to see, as tubes of cuboidal epithelium with obvious lumens. These cells are involved some in exchanging ions.
The pancreatic acinar units are tubes of cuboidal epithelium. You usually will not see the lumens, because they are very tiny. Probably this is good, because the digestive enzymes need to get moving rather than staying around and possibly digesting the acini themselves.
This is pancreas.
With your study partners, find:
Hotshots: There is a bit of an island of Langerhans, an endocrine (no-ducts) gland, somewhere on this section. It is also composed of cuboidal cells, separated by capillaries.
Kansas City University of Medicine and Biosciences