# Chapter Three: Cell biology

### Cytoplasm - Protien producing organelles - The endoplastic reticulum

The endoplastic reticulum

Spreading throughout the cytoplasm is the endoplasmic reticulum. It is a folded system of membranes that loop back and forth giving it a very large surface area. This membrane provides a surface area for cell reactions. It is also the Site of lipid production. The E.R. comes in two forms:

Smooth E.R. has no ribosomes associated with it |  | The rough E.R. has ribosomes

< Take a tour of the smooth E.R. >
< Take a tour of the rough E.R. >

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