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20 Cards in this Set

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diffusion
movemnt of molecules from an area of high concentration to an area of low concentration
concentration gradient
difference in the concentration of molecules across a space
equilibrium
same throughout a space
osmosis
doesnt require energy;
h20 molecules difuse across a cell membarane from an area of high concentration to an area of lower concentration
hypotonic
swell; water into cell
hypertonic
shrink; water diffuses out of the cell
isotonic
normal; diffses into & out of cell
contractile vaculoes
collet excess water and contract pumping the water out of the cell
turgor pressure
pressure tha twater molecules exert against the cell wall
plasmolysis
water leaves cells through osmosis. cells shirnk away from th ecell walls and turgor pressure is lost
cytolosis
bursting of cells
facilitated diffusion
used for molecules that cant diffuse rapidly through a cell membrane
carrier proteins
to assist move molecules across a cell membrane
ion channels
diffusion; some are always open, other gates open and close,
active transport
requires a cell to expand energy
sodium potassium pump
example of active transport in animal cells involving a carrier protein
endocytosis
process by which cells ingest external fluid, macromolecules and large particles including cells
phagocytes
fuse virus and bacteria
pinocytosis
involves transport of solutes or fluids
exocytosis
vesicles fuse with cell membrane then release the contents into the cells