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    Lysosomes are membrane bound sacs that are filled with enzymes, manufactured by the golgi apparatus and are usually spherical in shape.  
However, shape and size may vary among different organisms.  Some of the enzymes contained in the lysosomes are nucleases which break down nucleic acids, proteases which break down proteins, lipases which break down lipids, and carbohydrases which break down carbohydrates.  Lysosomes are very important to our cells and if they malfunction and do
not work properly it can be very harmful to our bodies. Two diseases that are caused by defective function of the lysosomes are Tay-Sachs disease and Pompe's disease. 

    Lysosomes act as the disposal system for our cells.  Lysosomes break down complex proteins, lipids, carbohydrates and other macromolecules into simpler compounds.  These simple compounds are then returned to the cytoplasm of the cell where they are used as new building materials for the cell.  Lysosomes are used for digestion of cellular waste products, dead cells, or other extracellular material that may pose a threat to the cell.  Another very important function of the lysosome is it repairs damage that has been done to the plasma
membrane-they serve as a sort of membrane patch and help seal the wound in the cell membrane.  The last function of the lysosome is that they are involved in programmed cell death or autolysis, which is degradation of the cell's own components.  This involvement in autolysis has given lysosomes the nickname 'suicide sacs'.