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The endomembrane system regulates protein traffic and performs metabolic…

- - - - Smooth ER is so named because its outer surface lacks ribosomes.
      - .
        
        Rough ER has ribosomes on the outer surface of the membrane and thus appears rough through the electron microscope
- - - - Avesicle that buds from the ER can add its membrane and the contents of its lumen to the cis face by fusing with a Golgi membrane. The trans face gives rise to vesicles, which pinch off and travel to other sites.
- - - - Hydrolytic enzymes and lysosomal membrane are made by rough ER and then transferred to the Golgi apparatus for further processing. At least some lysosomes probably arise by budding from the trans face ofthe Golgi apparatus
      - Lysosomes also use their hydrolytic enzymes to recycle the
        cell's own organic material, a process called autophagy.
- - - - Vacuoles are membrane-bounded vesicles whose functions vary in different kinds of cells. Food vacuoles, formed by phagocytosis .Many freshwater protists have contractile vacuoles that pump excess water out of the cell,
      - Mature plant
        cells generally contain a large central vacuole
        
        The plant cell's central vacuole is a versatile compartment It can hold reserves of important organic compounds, such as the proteins stockpiled in the vacuoles of storage cells in seeds.