Endoplasmic Reticulum

Materials are transported throughout the cell by a system of channels or canals called the endoplasmic reticulum (ER). Chemical reactions take place on the surface of the endoplasmic reticulum. In some places, it is smooth. The rough surface is due to the presence of ribosomes. Cells making proteins contain a large amount of endoplasmic reticulum.

This is the rough endoplasmic reticulum.