The Cell in its Environment

Selective permeable: some materials can pass through membrane while others can't



Diffusion: main method of movement of particles across the cell membrane



Osmosis: diffusion of water molecules across cell membrane



* the rule for diffusion and osmosis: molecules move from an area of high concentration to an area of low concentration



Equilibrium: balance of molecules

DIFFUSION
*sugar
*salt
*h2o
*co2
*o2
*food
*waste
*drugs/alcohol

(osmosis only water)