It separates the cell into different compartments, or organelles, such as the nucleus, the endoplasmic reticulum (ER), the Golgi apparatus, and lysosomes.
The endomembrane system includes the endoplasmic reticulum (ER), Golgi apparatus, and lysosomes.
Vesicles also allow the exchange of membrane components with a cell's plasma membrane.
It is responsible for the synthesis and transport of proteins and lipids.