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bio 3.3-3.5 terms

TermDefinition
cell membrane double layer of phospholipids that forms a boundary between a cell and the surrounding environment; controls what passes in and out of a cell
phospholipid a lipid that contains phosphorus; a structural component in the cell membranes
fluid mosaic model model that describes the arrangement and movement of molecules that make up a cell membrane
selective permability condition of allowing some, not all, materials to cross the membrane and enter the cell
receptor protein that detects a signal molecule and performs an action in response
passive transport the movement of substances across a cell membrane without the use of energy by the cell
diffusion the movement of particles from areas of higher density to areas of lower density
consentration gradient the difference in the concentration of a substance across a distance
osmosis the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of a solute) through a membrane that is permeable to the solvent
isotonic solution that has equal cocentration of dissolved particles compared with another solution
hypertonic describes a solution whose solute concentration is higher than the solute concentration inside the cell
hypotonic describes a solution whose solute concentration is lower than the solute concentration inside a cell
facilitated diffusion the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
active transport the movement of chamical substances, usually across the cell membrane, against a concentration gradient; requires a cell to use energy
endocytosis the process by which a cell membrane surrounds a particle in a vesicle to bring the particle into the cell
phagocytosis uptake a solid particle into a cell by engulfing the particle
exocytosis the process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance out
Created by: megan_boehl1