Question

what is endoplasmic reticulum?what are the two types of endoplasmic reticulum?write its main function?

Answer 1

The endoplasmic reticulum (ER) is a type of organelle found in eukaryotic cells that forms an interconnected network of flattened, membrane-enclosed sacs or tube-like structures known as cisternae. The membranes of the ER are continuous with the outer nuclear membrane. The endoplasmic reticulum occurs in most types of eukaryotic cells, but is absent from red blood cells and spermatozoa.
There are two types of endoplasmic reticulum: rough (granular) and smooth (agranular)
1. Rough endoplasmic reticulum:- There are a lot of ribosomes on its surface and reticulum’s main function is protein synthesis.
2. Smooth endoplasmic reticulum:- It takes part in many metabolic processes, for example synthesis of lipids, phospholipids and steroids

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