Bio CP 7-3 Cell Boundaries
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Created by:
kelseyc228 on November 23, 2010
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16 terms
Terms | Definitions |
|---|---|
 cell membrane | regulates what enters and leaves the cell and also provides protection and support |
| cell wall | provides support and protection for the cell |
| lipid bilayer | a double layered sheet which is the composition of nearly all cell membranes |
| concentration | the mass of a solute in a given volume of a solution, or mass/volume |
| diffusion | particles in a solution tend to move from one area that is more concentrated to an area that is less concentrated |
| equilibrium | When the concentration of a solute is the same without a system |
| osmosis | the diffusion of water through a selectivly permeable membrane |
| isotonic | "same strength" when two solutions are equall in strength |
| hypertonic | "above strength" when one solution is greater than the other |
| hypotonic | "below strength" one one solution is less than the other |
| facilitated diffusion | molecules that can not diffuse across the cell membranes lipid bilayer on their own move through protein channels instead |
| active transport | cells sometimes must move materials in the oppostite direction - against a concentration diffrence |
| endocytosis | taking materials into the cell by means of infoldings, or pockets of the cell membrane |
| phagocytosis | extensions of cytoplasm surround a particle and package it within a food vacuole |
| pinocytosis | tiny pockets form along the cell membrane, fill with liqued, and pinch off to form vacuoles within the cell |
| exocytosis | the membrane of the vacuole sourounding the material fuses with the cell membrane, forcing contents out of the cell |
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