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Biology Chapter 5.2

Biology Chapter 5.2 Terms and Definitions

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 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
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 microorgansims
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: conoverc20
 

 



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