Transport in cells - Edexcel Comparing diffusion, osmosis and active transport
Diffusion is the movement of particles from a high to lower concentration. Osmosis is the diffusion of water across a membrane. Active transport moves particles from low to higher concentration.
In animals, plants and microorganismMicroscopic (too small to see) organisms, such as bacteria and viruses, substances move into and out of cells by diffusionThe movement of molecules from an area of higher concentration to an area of lower concentration., osmosisThe movement of water molecules across a selectively permeable membrane from a region of higher water concentration to a region of lower water concentration. and active transportThe transport of molecules against their concentration gradient from a region of low concentration to a region of high concentration..
Process
Description
Substances transported
Energy required
Diffusion
Substances move from a high to a lower concentration down a concentration gradient
