Vesicles are cellular organelles that are composed of a lipid bilayer. They are used to transport materials through the inside of the cell. Vesicles are formed naturally during the process of endocytosis and exocytosis. Vesicles can also function in metabolism and enzyme storage. There are four types of vesicles used by cells. These include: vacuoles, lysosomes, transport vesicles, and secretory vesicles. Lysosomes are cellular vesicles that contain digestive enzymes. They are used to break down food particles and to get rid of un-needed cellular particles. Lysosomes are like the garbage men of the cell. Their job is to take waste, digest it, and remove it from the cell. Lysosomes break down biomolecules engulfed by the cell. Examples include: nucleic acids, peptides, carbohydrates, and lipids.
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