Lysosomes (Gr. lyso, dissolving soma, body) are membrane bound
spherical organelles that contain enzymes called acid
hydrolases, which are capable of digesting organic molecules
(lipids, proteins, nucleic acids, and polysaccharides) under acidic
conditions. The enzymes are synthesized in the ER, transported to
the Golgi apparatus for processing, and then secreted by the Golgi
apparatus in the form of lysosomes or as vesicles that fuse with
lysosomes. Lysosomes fuse with phagocytic vesicles,
thus exposing the vesicle’s contents to lysosomal enzymes.
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