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Ch5 Test Homeostasis

2/6/12

QuestionAnswer
Passsive transport does not require energy from the cell when a substance is going from high to low concentration
active transport movement of a substance against it's concentration gradient. is going from high to low concentration and requires energy
concentration gradient the difference in the concentration of molecules across a space
equilibrium concentration of molecules is equal throughout a space
diffusion movement of a substacne down the substance's concentration gradient. When it spreads through a liquid or gas from high to low concentration.
osmosis diffusion of water through a membrane
hypertonic soulution causes a cell to shrink because of osmosis. concentration higher outside than concentration in cytosol.
hypotonic solution causes a cell to swell because of osmosis.conentration of solute outide is lower than the concentrationin the cytosol.
isotonic solution concentration of both solutions is equal.
ion channel transport protein through which ions can pass
carrier protein protein used to transport specific substances across a cell membrane.assist molecules across by binding to the molecule which changes the shape which allows the molecule to pass through.
facilitated diffusion passive transport using carrier proteins. process used when molecules cannot diffuse rapidly acoss the membrane, even with a concentration gradient.
sodium-potassium pump an example of a cell membrane pump
endocytosis movement of a substance by a vesicle to the inside of a cell. cells ingest external fluid , macromolecules and other large particles
exocytosis movement of a substance by a vesicle to the outside of a cell.When cells use energy to expel large particles
vesicle organelle that fuses with lysosomes in order that contents can be digested
contractile vacuole organelle that pumps water out of the cell
kinetic energy that drives diffusion
plasmolysis plant cells wilting due to a lose of water through osmosis
turgor pressure produced by water pushing outward against the cell wall of plants
pinocytosis cell drinking. transports fluids.
ion channels how charged particles like Na+ and K+ move across the membrane
cytolysis cells bursting from excess water pressure inside them
carrier proteins proteins used during facilitated diffusion
phagocytosis cell eating. when large particles are engulfed
crenation animal version of plasmolysis
Created by: RisaS
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