ENDOPLASMIC RETICULUM:
DEFINATION:
An interconnecting network network of cisternae(elongated closed sacs) which is generally extended from plasma membrane to nuclear membrane throughout cytoplasm of all eukaryotic cells called ENDOPLASMIC RETICULUMTYPES:
There are two types of endoplasmic reticulum1-Rough endoplasmic reticulum
2-Smooth endoplasmic reticulum
Most cells have both types of ER. Some cells have (skeletal muscel cell) smooth ER more where they are called SARCOPLASMIC RETICULUM
ROUGH ENDOPLASMIC RETICULUM:
Rough ER has smooth appearance under electron microscope. Ribosome are attach to it's surface so Rough ER involved in the function of protein synthesis. Presence of rough ER in cell also provide mechanical support to cellSMOOTH ENDOPLASMIC RETICULUM:
Smooth ER has smooth appearance under electron microscope ribosome are not attach to it's surface. Smooth ER continnue with rough ER. Function of smooth ER are1-Metabolism of carbohydrate
2-Formation of lipid such as phospholipid, oil and steroid
3-Detoxifixation of drugs especially in liver cell
4-It also store calcium ion, when releases calcium ion triggers the contraction of muscel
5-It also involved in the transport of material within cell or out of cell for example protein made in ROUGH ER transport to Golgi complex through smooth endoplasmic reticulum
6- Presence of smooth endoplasmic reticulum also provide mechanical support to the cell
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