Endoplasmic reticulum, illustration - stock illustration

Endoplasmic reticulum, illustration. The endoplasmic reticulum (ER) is a dynamic cell organelle that can be of two types, wither-rough endoplasmic reticulum (RER), or smooth endoplasmic reticulum (SER). They both consist of a continuous system of flattened tubules and sacs bound by a single membrane. Endoplasmic reticulum serves many functions including protein synthesis and folding, lipid synthesis and calcium storage