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Active Transport
Lesson 5.2 Vocabulary
Term | Definition |
---|---|
Active Transport | The movement of chemical substance, 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 |