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Cell Transportation
Term | Definition |
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diffusion | movement of dissolved molecules in a fluid or gas from a region of higher concentration to an area of lower concentration |
facilitated diffusion | diffusion of molecules assisted by protein channels that pierce a cell membrane |
osmosis | diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration |
active transport | energy requiring movements of molecules across a membrane from a region of lower concentration to an region of higher concentration |
endocytosis | the process of taking liquids or fairly large molecules in a cell by engulfing them in a membrane |
exocytosis | the opposite of endocytosis; is the release of substances out of a cell by the fusion of a vesicle with the membrane |
selective permeability | condition or quality of allowing some, but not all, materials to cross the barrier or membrane |
hypertonic solution | solution that has a higher concentration of dissolved particles than a cell |
hypotonic solution | solution that has a lower concentration of dissolved particles than a cell |
isotonic solution | solution that has an equal concentration of dissolved particles compared with another solution |