Endoplasmic Reticulum
Rough Endoplasmic Reticulum
The Rough ER is like the smooth ER except that it has ribosomes on the outside as you can see by touching the Rough ER picture.  In the Rough ER, protein is massely produced.
Smooth Endoplasmic Reticulum
The smooth endoplasmic reticulum is called a smooth ER because it has no ribosomes(touch picture to see a closeup) on it unlike the Rough ER.  It has a tube shape.  It also is involved in the synthesis of steriods.  The smooth ER also produces lipids for the cell.  It runs from the cell membrane to the nuclear membrane.
VACATION SITE:  Move around on the Smooth ER express to the cytoplasm!  On the Rough ER, you can climb on the structure by holding onto the ribosomes!
CAUTION: Don't fall off!
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