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03.5 Active Transport, Endocytosis, and Exocytosis
Cells use energy to transport materials that cannot diffuse across a membrane.
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| active transport | energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration |
| endocytosis | uptake of liquids or large molecules into a cell by inward folding of the cell membrane |
| phagocytosis | uptake of a solid particle into a cell by engulfing the particle |
| exocytosis | release of substance out of a cell by the fusion of a vesicle with the membrane |
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