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Biology Ch. 5.2

TermDefinition
Active Transport The movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy
Sodium-Potassium Pump A carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell
Endocytosis The process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
Vesicle A small cavity or sac that contains materials in a eukaryotic cell; forms when part of the cell membrane surrounds the materials to be taken into the cell or transported within the cell
Pinocytosis A method of active transport across the cell membrane in which the cell takes in extracellular fluids
Phagocytosis The process by which a cell engulfs large particles or whole cells, either as a defense mechanism or as a means to obtain food
Phagocyte A cell that ingests and destroys (digests) foreign matter or microorganisms
Exocytosis The process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance out
Created by: HuffmanV20
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