B2 Diffusion

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  • Diffusion
    • spreading out of particles from an area of high concentration to an area of low concentration
    • concentration gradient
    • happens in solutions and gases
    • bigger difference in concentration- faster diffusion rate
    • very small molecules can diffuse through the cell membrane
    • small molecules- oxygen, glucose, amino acids and water
    • big molecules can't fit- starch and proteins
    • net movement


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