A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. Lysosomes function as the digestive system of the cell, serving both to degrade material taken up from outside the cell and to digest obsolete components of the cell itself. They have a simple structure; they are spheres made up of a lipid bilayer that encloses fluid that contains a variety of hydrolytic enzymes. Lysosomes are formed by budding off of the Golgi apparatus and the hydrolytic enzymes within them are formed in the endoplasmic reticulum. Lysosomes are membrane bounded organelles found in animal and plant cells. They assist with degrading material taken in from outside the cell and life expired components from within the cell.

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