what do the endoplasmic reticulum do
Endoplasmic reticulum is a network of tubules, vesicles and sacs that are interconnected. They may serve specialized functions in the cell including protein synthesis, sequestration of calcium, production of steroids, storage and production of glycogen, and insertion of membrane proteins.he endoplasmic reticulum (ER) is an organelle that appears in all eukaryotic cells, usually surrounding the nucleus. The ER is made of a series of membranes that extend throu â¦ ghout the jelly-like cytoplasm and kind of form a maze.