Unformatted text preview: vesicle. There are three kinds of endocytosis: • Phagocytosis (“cellular eating”) occurs when undissolved material enters the cell. The plasma membrane engulfs the solid material, forming a phagocytic vesicle. • Pinocytosis (“cellular drinking”) occurs when the plasma membrane folds inward to form a channel allowing dissolved substances to enter the cell. When the channel is closed, the liquid is enclosed within a pinocytic vesicle. • Receptor-mediated endocytosis occurs when specific molecules in the fluid surrounding the cell bind to specialized receptors in the plasma membrane. As in pinocytosis, the plasma membrane folds inward and the formation of a vesicle follows. Certain hormones are able to target specific cells by receptor-mediated endocytosis....
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- Spring '10