Proteins are synthesised on the ribosomes bound to the endoplasmic reticulum
2. Synthesised proteins pass into the endoplasmic reticulum's cisternae and are packaged into transport vesicles
3. Transport vesicles containing the newly synthesised proteins move towards the Golgiapparatus via the transport function of the cytoskeleton
4. The vesicles fuse at the cis face of the Golgi, where the proteins enter and are structurallymodified before leaving the Golgi in vesicles from its trans face
5. Secretory vesicles move towards and fuse with the cell-surface membrane, releasing their contents outside the cell by exocytosis.Lyosomes don't do this; they contain enzymes for use inside the cell