(tanpa judul)

The Endoplasmic Reticulum
The endoplasmic reticulum (ER) is a complex set of internal membranes that may have ribosomes attached (rough or granular endoplasmic reticulum; RER or GET) or may be devoid of ribosomes (smooth or agranular endoplasmic reticulum; SER or AER)
The ER has many important functions:
1	It transports proteins, lipids, and other materials within the cell
2	It is a major site of cell membrane synthesis
3	ER-associated enzymes and ribosomes synthesize lipids and many proteins
4	New ER is produced through expansion of old ER