Diffusion

• For an organism to function, substances must move into and out of cells.
• Three processes contribute to this movement – diffusion, osmosis and active transport.
• Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
• In diffusion, particles move continuously and will spread themselves evenly throughout a liquid or a gas.
• If there is a situation where particles of a substance are in a higher concentration, they will move from this region to where they are in a lower concentration.
• Osmosis is the movement of molecules from an area of higher concentration to an area of lower concentration.
• In osmosis, particles move continuously and will spread themselves evenly throughout a liquid or a gas.
• Active transport is the movement of molecules from an area of higher concentration to an area of lower concentration.
• In active transport, particles move continuously and will spread themselves evenly throughout a liquid or a gas.
• Diffusion, osmosis and active transport are three different processes that contribute to the movement of substances into and out of cells.
• The movement of molecules from an area of higher concentration to an area of lower concentration is called diffusion.