Std 2

Created by Amberholloway 

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active transport

the movement of materials through a cell membrane using energy

concentration gradient

the difference in the concentration of molecules across a distance

diffusion

process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated

dynamic equilibrium

result of diffusion where there is continuous movement of particles but no overall change in concentration

endocytosis

process by which a cell takes in a substance by surrounding it with the cell membrane

exocytosis

process by which vesicles release their contents outside the cell

facilitated diffusion

pathway provided by transport proteins that helps certain molecules pass through a membrane

hypertonic

when comparing two solutions, the solution with the greater concentration of solutes

hypotonic

when comparing two solutions, the solution with the lesser concentration of solutes

impermeable

preventing especially liquids to pass or diffuse through

isotonic

of or involving muscular contraction in which tension is constant while length changes

lipid bilayer

double layered sheet that forms the core of nearly all cell membranes

osmosis

diffusion of water through a selectively permeable membrane

passive transport

the movement of substances across a cell membrane without the use of energy by the cell

permeable

allowing (especially liquids) to pass or diffuse through

phagocytosis

process in which extensions of cytoplasm surround and engulf large particles and take them into the cell

pinocytosis

process by which certain cells can engulf and incorporate droplets of fluid

selectively permeable membrane

membrane that allows some substances to pass more easily than others and blocks the passage of some substances altogether

solute

substance that is dissolved in a solvent to make a solution

solution

mixture of two or more substances in which the molecules of the substances are evenly distributed

solvent

a liquid substance capable of dissolving other substances

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