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semi-permeable membranes that allow some substances through but not others
cell membrane (aka plasma membrane) A cell structure that controls which substances can enter or leave the cell.
cytoskeleton A network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement
active transport The movement of materials through a cell membrane using energy.
carrier protein a protein that transports substances across a cell membrane
concentration gradient A difference in the concentration of a substance across a distance.
diffusion Movement of molecules from an area of higher concentration to an area of lower concentration.
endocytosis A process in which a cell engulfs extracellular material through an inward folding of its plasma membrane.
exocytosis a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.
osmosis Diffusion of water through a selectively permeable membrane
passive transport The transportation of materials across a plasma membrane without using energy.
facilitated diffusion A process in which substances are transported across a plasma membrane with the concentration gradient with the aid of carrier (transport) proteins; does not require the use of energy.
homeostasis A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level
isotonic Having the same solute concentration as another solution.
hypertonic Having a higher concentration of solute than another solution.
hypotonic Having a lower concentration of solute than another solution
Created by: kmaddix
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