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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