is a small part
receives, refines, stores, and distributes chemical products of the cell
The rough endoplasmic reticulum (RER) has a bumpy appearance due to the presence of ribosomes on its surface. These ribosomes are responsible for protein synthesis, giving RER its characteristic rough texture. The RER is an extensive network of tubules and flattened sacs that are interconnected throughout the cytoplasm of a cell.
Looks like a Golgis Aparatus.