DRAFT: This module has unpublished changes.
The endoplasmic reticulum (ER) is the packaging system of the cell. It's kind of like putting toys into boxes for presents. The presents are the proteins, and the boxes are vesicles. There are two types of endoplasmic reticulum - smooth and rough.
The rough endoplasmic reticulum has ribosomes stuck to it. After a ribosome makes the proteins, the rough ER puts puts the proteins into a tiny round ball called a vesicle. Then, the rough ER sends the vesicle to the Golgi apparatus.
The smooth endoplasmic reticulum does lots of things:
1. It breaks down fats.
2. It stores important nutrients of the cell called ions.
3. If somebody eats or drinks something poisonous, then it can
 try to detoxify it to make it go away.

So, like I said, once the proteins are packaged in the rough ER, the vesicle moves onto the Golgi apparatus.

DRAFT: This module has unpublished changes.