Diffusion
Movement of particles or molecules from an area of high concentration to an area of low concentration
Osmosis
Diffusion of water across a selectively permeable membrane
Selectively pemeable membrane
A membrane that allows certain materials to pass through, but not others
Tonicity
A description of the relative solute concentration in a solution as compared to another solution.
Equilibrium
The condition that exists in system when there is a relatively equal distribution of a particular molecule
Hypertonic
A solution that has a higher concentration of solutes than another.
Hypotonic
A solution that has a lower concentration of solutes than another.
Isotonic
Two solutions that have an equal concentration of solutes.
solute
substance thatn is dissolved in a solution
cell membrane
regulates and controls what enters or leaves the cell
facilitated diffusion
this form of diffusion is regulated by protein channels in the membrane and requires no energy input from the cell
active transport
movement of molecules or ion into or out of the cell against its concentration gradient (from low to high) and requires an input of energy.