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Cellular Transport

TermDefinition
phospholipid bilayer a flexible double-layered sheet that makes up the plasma membrane and form a barrier between the cell and its surroundings
selectively permeable a property of biological membranes that allows some substances to pass across while others cannot; also called semipermeable membrane
homeostasis relatively constant internal physical and chemical conditions maintained by an organism
passive transport the movement of molecules across the cell/plasma membrane without using cellular energy
diffusion process by which particles tend to move from an area of high concentration to low concentration
facilitated diffusion process of diffusion in which molecules pass across the membrane through protein channels in the cell/plasma membrane
aquaporin water channel protein in a cell/plasma membrane
osmosis diffusion of water through a selectively permeable membrane
isotonic when the concentration of two solutions is the same; inside and outside the cell
hypertonic when comparing two solutions, the solution with the greater concentration of solutes
hypotonic when comparing two solutions with the lesser concentration of solutes
endocytosis the process of bringing material into a cell by parts of the membrane folding inward or forming pockets
exocytosis the membrane of a vesicle or vacuole fuses with the cell/plasma membrane forcing the contents out of the cell
phagocytosis a kind of endocytosis in which extensions of the cell surround a particle and package it within a food vacuole; cell takes in large particles
pinocytosis tiny pockets form along the cell/plasma membrane. fill with liquid, and pinch off to form vacuoles; cells take in water
hyper- a prefix meaning more
hypo- a prefix meaning low
iso- a prefix meaning the same
unsaturated when a solution has a lower amount of solute than solvent
saturated when a solution has an equal amount of solute and solvent
supersaturated when a solution has a greater amount of solute than solvent
Created by: traceeharts
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