membrane transport/moving molecules

diffusion

movement of molecules from areas of HIGH concentration to LOW concentration

another way to describe diffusion

molecules moving down their concentration gradient

plasma membrane

barrier between cells and their environment

simple diffusion

molecules moving from high to low concentration DIRECTLY ACROSS a cell membrane

which type of transport is simple diffusion

what is osmosis

• type of diffusion that uses water

osmosis moves water from what to what

moves water from low to high concentration

hypotonic

low solute concentration than other solution

isotonic

same solute concentration as other solution

hypertonic

higher solute concentration than other solution

faciliatated diffusion

molecules move down concentration gradient across plasma membrane through transport proteins

which type of tranposrt is faciliated diffusion

passive transport

passive transport

molecules moving down their gradient

• high to low

active transport

molecules move against the gradiant

• low to high

what does active transport require

requires ATP and transport proteins