Substances may move into and out of cells across the cell membranes via diffusion., , Diffusion is the spreading of particles, resulting in a net movement from an area of high concentration to low., , Oxygen and carbon dioxide are transported through diffusion during gas exchange., , Some waste products such as urea move out of our cells and into our blood plasma by diffusion., , Having a higher concentration gradient speeds up the rate of diffusion., , Higher temperatures mean particles vibrate and move faster so this speeds the rate of diffusion., , Membranes with a larger surface area allow diffusion to occur across them faster., , Many features of living organisms are adapted to allow diffusion to occur faster, in the lungs and intestines for example.., .

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