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unit 4; section 3
cell transport
Term | Definition |
---|---|
diffusion | Process by which particles tend to move from an area where they are more concentrated to an are where they are less concentrated |
passive transport | Doesn’t need energy to transport |
facilitated diffusion | Process of diffusion in which molecules pass across the membrane through cell membrane channels |
aquaporins | water channel protein in a cell |
osmoisis | Diffusion of water through a selectively permeable membrane |
isotonic | when the concentration of two solutions is the same |
hypertonic | When comparing two solutions, the solution with the greater concentration of solutes |
hypotonic | When comparing two solutions, the solution with the lesser concentration of solutes |
osmotic pressure | Pressure that must be applied to prevent osmotic movement across a selectively permeable membrane |
active transport | the movement of materials against a concentration difference is known as active transport |
endocytosis | the process of taking material into the cell by means of in folding, or pockets, of the cell membrane. |
phagocytosis | is a type of endocytosis, in which extensions of cytoplasm surround a particle and package it within a food vacuole |
exocytosis | the membrane of a vesicle surrounds the material then fuses with the cell membrane. The contents are forced out of the cell. |