Diffusion - the process by which molecules spread from areas of high concentration, to areas of low concentration. The two kinds of diffusion are osmosis and facilitated diffusion. An example is when you have an air freshener in your house and you go to the other side of the room, you can smell the air freshener because it was spread throughout the entire room to smell the same.
Osmosis - the diffusion of water (across a membrane)Facilitated Diffusion: molecules diffuse across membranes, with the help of transport proteins.
Active Transport- When cells must move materials in an opposite direction - against a concentration gradient. Transport proteins within the membrane must use energy (ATP) to move substances either to the inside or outside of the membrane.
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