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While in endocytosis substances enter cells, there is an inverse process: exocytosis.
Once endocytized, the material undergoes transformations and the resulting products are absorbed through the membrane of the organite and remaining what remains in the gall bladder from which it will be subsequently exocited.
Exocytosis thus allows the excretion and secretion of substances and occurs in three stages: migration, fusion and release. In the first, exocytosis vesicles travel through the cytoplasm. In the second, the vesicle fuses with the cell membrane. Lastly, the contents of the gallbladder are released into the extracellular medium.