Endocytosis and exocytosis are forms of bulk transport mechanisms that move large molecules or particles. In endocytosis, the cell engulfs substances into a vesicle, which can be further categorized into phagocytosis (cell eating) and pinocytosis (cell drinking). Exocytosis involves the fusion of vesicles with the plasma membrane to release contents outside the cell, playing a critical role in neurotransmitter release and hormone secretion.
