What is the function of the endoplasmic riticulum?

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The endoplasmic reticulum is a series of interconnected sacks and tubes made of membrane. Generically, those tubes help transport materials about the cell. There are two kinds of endoplasmic reticulum (ER). The rough ER is called that because it is covered with ribosomes. Those ribosomes synthesize proteins that are inserted into the inside of the Rough ER. There, the proteins often go through changes, etc. while being transported to other parts of the cell such as the Golgi Complex. The Smooth ER has no ribosomes on it and is where various fats and phospholipids are made. In some cells, like in your liver, the Smooth ER is involved in the breakdown of toxins, etc. Other specialized versions of the ER are used in cells for storage, such as the modified ER found in muscle cells called the Sarcoplasmic Reticulum that stores Calcium ions for use in muscle contraction.

folding and the transport of synthesized proteins in sacs called cisternae. Correct folding of newly-made proteins is made possible by several endoplasmic reticulum chaperone proteins, including protein disulfide isomerase (PDI), ERp29, the Hsp70 family member Grp78, calnexin, calreticulin, and the peptidylpropyl isomerase family. Only properly-folded proteins are transported from the rough ER to the Golgi complex.

also, it is spelled endoplasmic reticulum

it is highway system of cell on rough er there are ribosomes on smooth there is not. the smooth er also acts  to break down toxins and lipids

to direct nutrients to the different parts of the body