The Endoplasmic reticuluman is an organelle composed of an extensive network of folded membranes which perform several tasks within a cell. Notably, processing of secretory proteins, steroid synthesis, and calcium storage.
The organelle can be divided into two main sections:
- Rough endoplasmic reticulum - so called because of the ribosomes on its surface, this is where synthesis of secreted proteins occurs
- Smooth endoplasmic reticulum - does not have ribosomes, major site of lipid metabolism and post-translational protein modifications.
- Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998