Pancreas cells. Coloured scanning electron micrograph (SEM) of acinar (exocrine) pancreatic cells. 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 (red). The enzymes are activated in the small intestine and aid the breakdown of carbohydrates, fats and proteins. Magnification: x330 when printed 10 centimetres wide.