Golgi apparatus consists of a stack of called cisternae. lt modifies a number of cell sacs products delivered to it, often enclosing them in vesicles to be secreted. Such products include trypsinogen(from pancreatic acinar cells, insulin(from beta-cells of the Islets and mucin(from goblet cells in the trachea). The Golgi is also involved in lipid modification in cells of the ileum, and plays a part in the formation of lysosomes.