Rough Endoplasmic Reticulum!
The Endoplasmic Reticulum is a huge system of interconnected, membranous, in-folded and convoluted sacks that are located in the cell's cytoplasm. A cell contains two types of ER's. The first is the rough endoplasmic reticulum, or rough ER. The rough ER is covered with ribosomes giving it its rough appearance. The rough ER transports materials throuth the cell and produces proteins in sacks called cistern which are then sent to the Golgi body or inserted into the cell membrane. The rough ER is connected to the Nuclear membrane as well as the smooth ER.http://www.kaskaskia.edu/BCambron/Biology%20101%20Chapter%204_files/image006.jpg
Smooth Endoplasmic Reticulum!
The second type of ER is the Smooth Endoplasmic Reticulum or smooth ER. The smooth ER does not have ribosomes on its surface. It makes up proteins and lipids that get exported by the cell. The smooth ER also controls calcium level in the muscles and detoxifies poisons, alcohol, and drugs.