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A: Endocytosis and exocytosis are similar because they both allow patches of the membrane to flow from one compartment to another. According to Pearson Education, both processes require the cell to be dynamic instead of static.
Exocytosis is the reverse of pinocytosis, i.e. the extrusion of fluid contained in vesicles into the extra cellular space. Endocytosis and exocytosis are important mostly for membrane flow. For example, exocytosis replaces the plasma membrane removed by phagocytosis.