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ryan valentine

ch 4 cells and their environment

TermDefinition
Passive transport Movement across the cell membrane that does not require energy
Concentration gradient Difference in the concentration of a substance
Equilibrium Is a condition in which the concentration is equal throughout a space
Diffusion The movement of a substance from an area of high concentration to an area of low concentration
Osmosis The diffusion of water throgh a selectively premeable membrane
Hypertonic solution A solution that causes a cell to shrink because of osmosis
Hypotonic solution A solution that causes a cell to swell because of osmosis
Isotonic solution A solution that produces no change in volume
Ion chanel Is a transport protein with a polar pore through which ions can pass
carrier protein Can bind to one side of the cell membrane to carry the substance across the cell membrane
facilitated diffusion When a carrier protein carries amino acid and sugars down there concentration gradient
Active transport The transport of a substance across the cell membrane against its concentration gradient
Sodium-potassium pump Transports three sodium ions out of the cell and tw the cello potassium ions into
Endocytosis The movement of a substance into a cell by vesicle
Exocytosis The movement of a substance by a vesicle to the outside of the cell
Receptor protein Is a protein that binds to a specific signal molecule
Second messanger Acts as a signal molecule in the cytoplasm
Created by: littledog
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