The ribosomes are located on the cytosolic side of the endoplasmic reticulum, which is also called the ER. Rough and smooth ER are typically connected to one another so that the proteins and membranes made by the rough ER can freely move into the smooth ER for transport to other parts of the cell. Despite sharing a location, the smooth and rough ER perform different functions to facilitate basic operations within cells. It is called ‘rough’ endoplasmic reticulum because it is studded on its outer surface (the surface in …

rough endoplasmic reticulum This is an extensive organelle composed of greatly convoluted but flattish sealed sacs, which are contiguous with the nuclear membrane. The rough ER (endoplasmic reticulum) function involves the assembly of proteins and the transportation of those assembled ready proteins to where they will be used by the body. The endoplasmic reticulum is a network of tubules and flattened sacs that serve a variety of functions in plant and animal cells . The smooth ER (endoplasmic reticulum) function involves manufacturing and packaging, including the synthesis of lipids and hormones which are used for the production of new cellular membranes. Rough endoplasmic reticulum, series of connected flattened sacs, part of a continuous membrane organelle in the cytoplasm of eukaryotic cells, that plays a central role in protein synthesis. The rough endoplasmic reticulum, also called the RER, is involved with protein synthesis. The primary Rough Endoplasmic Reticulum function of the rough endoplasmic reticulum is the processing and the production of specific proteins at ribosomal sites, which will be exported later. The ribosomes in the rough ER perform their tasks and create proteins that will be sent to the rough endoplasmic reticulum to undergo advance processing.
The RER gets its name from a series of studded ribosomes that produce proteins. The RER works by producing proteins and helping them fold properly. The RER is named for the appearance of its outer surface, which is studded with protein-synthesizing ribosomes.

The rough ER is an ancillary component of the broader endoplasmic reticulum, which contains a smooth surface in addition to the rough edges of the ER.