The golgi apparatus is a stacked array of membrane bounded sacs. It has what is known as a Cis face and a Trans face. A variety of intracelluar vesicles interact with the Golgi apparatus. Vesicles originating from the endoplasmic reticulum fuse with the cis face. Several different types of vesicles originate from the trans face (trans golgi network or TGN) and can have different destinations. Some of these vesicles carry proteins to be secreted from the cell by exocytosis. Others will from primary lysosomes and others have embedded in their membranes integral membrane proteins to be carried to the plasma membrane by exocytosis. To find out more about this process explore the functioning of the endomembrane system.