Define and provide examples:

Impermeable: allows no substance to pass through it

Selectively Permeable: only allows certain substances to pass through it

Permeable: everything and anything can pass through it easily

Cellular Transport: movement of substances into and out of a cell

Diffusion

• movement of particles from an area of many of them (high concentration) to an area of few of them (low concentration)
• diffusion continues until both areas have the same number of particles

Osmosis

• a type of difusion
• movement of water through a "selectively permeable membrane
• vital to cell's survival because water must stay constant inside cell

What factors affect diffusion?

-the warmer the temperature, the faster diffusion happens

Everyday examples of diffusion:

• air freshener - smelling it across the room
• smoking - inhale it across the room
• crystal light - diffused into water
• putting salt in the pasta water
• smoke from a fire can be smelled from a distance
• caffeine - absorbs into blood stream
• a pill/medicine absorbs into body
• putting sugar into coffee
• deflating a balloon
• smelling food in another room
• smelling gas at a gas stattion
• skunk, you can smell it from a while away.:)