Diffusion is a process that allows dissolved substances have to pass through the cell membrane to get into or out of a cell.
Diffusion occurs when particles spread.
The move from a region of high concentration to a regions of low concentration.
Diffusion happys when particles are free to move.
Particles diffuse down from a high concentration to a low concentration.
Examples of diffusion
Location Particles move From To
Gut digested food products gut cavity blood in capillary of villus
Lungs oxygen alveolar air space blood circulating around the lungs
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