Secretion of zymogens by an acinar cell of the pancreas. Zymogens are synthesized on ribosomes attached to the endoplasmic reticulum. They are subsequently processed in the Golgi apparatus and packaged into zymogen or secretory granules. With the proper signal, the granules fuse with the plasma membrane, discharging their contents into the lumen of the pancreatic ducts. Cell cytoplasm is depicted as pale green. Membranes and lumen are shown as dark green.