Pancreas cell. Coloured scanning electron micrograph (SEM) of an acinar (exocrine) pancreatic cell. Acinar cells produce and excrete digestive enzymes to the small intestine, via the pancreatic ducts. The enzymes are excreted in vesicles known as zymogen granules (purple). The enzymes are activated in the small intestine and aid the breakdown of carbohydrates, fats and proteins. Magnification: x1100 when printed 10 centimetres wide.