amino acids are joined to form polypeptide chains on a ribosome, attached to the rER.
polypeptide chain is passed through cisternae membrane to the lumen of the rER, chain is folded into precise 3d protein shape.
rER packages protein into vesicle to be transported to golgi.
ER vesicle fuses with golgi membrane to be part of it (fuses with cis face then moves through cisternae being modified in process and enters trans face)
protein packed into secretary vesicle to transport through cytoplasm.
moves to cell membrane, fuses and protein exits cell via exocytosis
