Lysosomes are digestive structures that help to break down waste and other materials in a cell. Some immune cells use lysosomes to destroy viruses and bacteria that they take in through Endocytosis. They are known as the garbage disposals of cells for a reason - their job is very similar in that they dispose of unwanted refuse, but on a cellular scale. They contain enzymes and other chemicals that work to break down the chemical bonds of things they take in, thus either destroying them or breaking them down for further processing elsewhere in the cell.
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