Cellular Transportation

Diffusion TO High Concentration Low Concentration

Equilibrium All is equal

Dynamic Equilibrium Particles are constantly in motion After diffusion, they continue to move Move at the same rate because no gradient exists

Facilitated Diffusion Required when size becomes issue Like gates in a fence Still use concentration gradient

Osmosis Movement of water across selectively permeable membrane Water goes, solute stays

Water movement related to a cell Water constantly moves in and out of the cell. (Dynamic Equilibrium) Rate at which it comes in and goes out can differ Depends upon concentration gradient Affects the shape of the cell

Isotonic Solution Concentration of water and solutes is equal inside and outside cell

Hypotonic Solution Solute concentration LOWER outside cell than outside Water enters cell Cell expands

Hypertonic Solution Solute concentration HIGHER outside the cell Water leaves the cell Cell shrinks

Active Transport If you’re active, you USE energy Requires input of energy Use ATP for energy

Na + /K + ATPase pump 3 Na + for 2 K +

Transporting the large stuff

Transporting the Large Stuff