STEP 1 Proteins and lipids that are made on the ER membranes are transported through the ER and are packaged in transport vesicles that bud off from the ER. STEP 1 Proteins and lipids that are made on the ER membranes are transported through the ER and are packaged in transport vesicles that bud off from the ER.

STEP 2 The vesicles fuse with the membrane of the Golgi bodies, dumping their contents into the Golgi. STEP 2 The vesicles fuse with the membrane of the Golgi bodies, dumping their contents into the Golgi.

STEP 3 Once inside the Golgi bodies, the molecules take one of many paths. Many become tagged with carbohydrates. STEP 3 Once inside the Golgi bodies, the molecules take one of many paths. Many become tagged with carbohydrates.

STEP 4 The molecules collect at the ends of the fold in the Golgi bodies. Vesicles pinch off and carry the molecules to other parts of the cell or to the plasma membrane where they will be secreted to the outside of the cell STEP 4 The molecules collect at the ends of the fold in the Golgi bodies. Vesicles pinch off and carry the molecules to other parts of the cell or to the plasma membrane where they will be secreted to the outside of the cell