Transport in cells

• For an organism to function, substances must move into and out of cells.
• Three processes contribute to this movement – diffusion, osmosis and active transport.
• Particles (molecules and ions) in a liquid and a gas move continuously due to diffusion.
• 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, a process known as diffusion.
• The movement of molecules from an area of higher concentration to an area of lower concentration is called diffusion.
• Overall movement from high to low concentration will end up evenly spread throughout the liquid or gas, but will continue to move.
• Some substances move into and out of living cells by diffusion, for example, in a leaf, the lungs, and liver cells.