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Vacuoles and Vesicles

 are small, saclike organelles that contain liquids or solid materials to be transported within the cell.    They are formed when a portion of the cell membrane, Golgi apparatus, or endoplasmic reticulum folds inward and pinches off.  Vesicles are composed of a phospholipid bilayer, which helps to keep molecules inside the vesicle.  Vesicles are used in processes such as endocytosis to transport large molecules inside the cell and exocytosis to release particles outside of the cell.
    Vesicles vary in shape and size.  The four most common vesicles are the vacuole, lysosome, transport vesicle, and the secretory vesicle.  The vacuole mostly contains water, and the lysosome helps in cellular digestion.  Transport vesicles move molecules within a cell while a secretory vesicle excretes molecules out of the cell.  Vesicles transport both foreign substances as well as newly synthesized molecules.  Basically, vesicles aid in the transportation of materials from one place to another.