| Term | Definition |
| Lumen | Spaces in Golgi Apparatus. |
| Cisternae | Sacs and spaces enclosed by the Endoplasmic Reticulum. |
| Rough ER | With ribosomes. |
| Smooth ER | Without ribosomes; Primary phospholipids and cholesterol source. |
| Cytosolic Face | Face of Smooth ER synthesis. |
| Scramblase | Evens out number of lipids in bilayer (Smooth ER). |
| Flippase | Establish and Maintain Orientation and asymmetry of membrane lipids. |
| Other functions of ER | Synthesis of steroid hormones (Testosterone, Estrogen); Drug Metabolism;Calcium Ion Storage;Carbohydrate Metabolism |