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3.3,3.4,3.5

TermDefinition
cell membrane the plasma membrane that forms a boundary between a cell and the outside
phospholipid a molecule composed of a charged phosphate group, glycerol, and two fatty acid chains
fluid mosaic model describes the arrangement of the molecules that make up a cell membrane
selective permeability means the cell membrane allows some, but not all materials to cross
Receptor a protein that detects a signal molecule and performs an action is response
Passive transport the movement of molecules across a cell membrane without energy input from the cell
diffusion the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration
concentration gradient the different in the concentration of a substance from one location to another
Osmosis water molecules move across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration
isotonic what a solution is to a cell if it has the same concentration of dissolved particles as the cell
hypertonic has a higher concentration of dissolved particles than a cell
hypotonic has a lower concentration of dissolved particles than a cell
facilitated diffusion the diffusion of molecules across a membrane through transport proteins
active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration
endocytosis the process of taking liquids or fairly large molecules into a cell by engulfing them in a membrane
exocytosis the opposite of endocytosis, is the release of substances out of a cell by the fusion of a vesicle with the membrane
phagocytosis a type of endocytosis in which the cell membrane engulfs large particles
Created by: swearzac4021