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Endocytosis
The process by which the plasma membrane pinches inward to form a vesicle that brings external materials into the cell.
Exocytosis
The process by which a vesicle fuses with the plasma membrane to release its contents outside the cell.
Vesicles
Vesicles are small, membrane-bound sacs composed of a phospholipid bilayer. They enclose a fluid-filled space and can carry various substances.