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The endoplasmic reticulum serves many general functions, including the folding of protein molecules in sacs called cisternae and the transport of synthesized proteins in vesicles to the Golgi apparatus.
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ITS a large netwrk of membrane bound tube and sheets extending from outer nucleur membrane towars plasma  membrane...
Based on presnce of ribosomes E.R is of two types:
RER.contains ribosomes and helps in protein synthesis..
SER which doesn't  contain ribosomes and helps in lipid synthesis and fat synthesis...it also helps in detoxification of poison and drugs...Its acts as intercellullar transportation channel carrying cell materials from one place to another...
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Hope this helps ☺
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