Endoplasmic reticulum is a large network of single membrane bound tubes and sheets as a result it is known as ERGASTOPLASM
It is of two types:
| Rough Endoplasmic Reticulum (RER) | Smooth Endoplasmic Reticulum (SER) |
| It plays a central role in protein synthesis. | It plays an important role in lipid synthesis. |
| It is structurally more stable. | It is structurally less stable. |
| This is formed of sac-like structures called cisternae. | This is formed of vesicles and tubules. |
| It is located in the central cytoplasm, connected to the nuclear membrane. | It is peripheral, connected to the plasmalemma. |
| Ribophorin proteins present at the junction between ribosomes and RER | Ribophorin protein is absent. |
| They are generally found in pancreatic cells. | They are generally found in adipose cells. |
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