simple and facilitated diffusion

passive transport

transport down the concentration gradient…no ATP needed

concentration gradient

concentration between two different regions

equilibrium

even distribution of particles within a given space

simple diffusion

net movement of molecules from an area of high concentration to an area of low concentration

facilitated diffusion

net movement of molecules from an area of high concentration to an area of low concentration using a channel protein

channel protein

provides a gateway for diffusion as certain particles cant pass through the membrane

temperature

high temperatures when particles have more energy cause faster movement

surface area

the greater surface area, the more molecules can move across at the same time

nature of molecules

large molecules require energy to move

particles that can diffuse

O2 , CO2, H2O

particles that cant diffuse simply

glucose, amino acids, ions

cylinder

SA=2πrh+2πr²…V=πr²h

cube

SA=6a²…V=a³

circle

SA=πr²…V=2πr²l