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Cell Transport Vocab

TermDefinition
Active Transport the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.
Concentration gradient a difference in the concerntration of a substance across a substance across a distance
Diffusion the movement of particles from regions of higher density to regions of lower density.
Equilibrium a stable situation in which forces cancel one another
Fluid Mosaic Model decorated with small pieces of colored glass or stone fitted together, a substance that is fluid at room temperature and pressure
Homeostasis The maintenance of a constant internal state in a changing environment by continually making adjustments to the internal and external environment.
Hypertonic discribes a solution whose solute concentration is higher than the solute concentration inside a cell.
Hypotyonic discribes a solution whose solute concentration is lower than the solute concentration inside a cell.
Isotonic a solution whose solute concentration is equal to the solute concentration inside a cell.
Osmosis The diffusion of water or another solvent from a more dilute solution(of a solute) to a more concentrated solution(of the solute) through a membrane that is permeable to the solvent.
Passive transport the movement of substances across a cell membrane without the use of energy by the cell.
Permeability the ability to let fluids pass through its open spaces, or pores
Phosopholipid a lipid that contains phosphorus and that is a structural component in cell membranes
Solute in a solution, the substance that dissolves in the solvent
solution a homogeneous mixture throughout which two or more substaces are uniformly dispersed.
Solvent in a solution, the substance in which the solute dissolves
Surface area-to-volume ratio is the amount of surface area per unit volume of an object or collection of objects.
Sodium potassium pump A special transport protein in the plasma membrane that transports sodium ions out of the cell and potassium ions into the cell against their concentration gradients. The process is powered by ATP.
Created by: Christensent