How can we help?

You can also find more resources in our Help Center.

Std 2

STUDY
PLAY
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