Diffusion

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  • Diffusion
    • Cell Membranes
      • Cell membranes hold the cell together AND let stuff in and out as well.
      • Dissolved substances can move in an out of cells by diffusion.
        • Only very small molecules can diffuse though cell membranes - things like oxygen, glucose, amino acids and water.
      • Big molecules like starch and proteins can't fit through the membrane.
    • Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.
    • Diffusion happens in solutions and gasses because the particles are free to move around randomly.
    • The bigger the difference in concentration, the faster the diffusion rate.
    • The simplest type of diffusion is when different gasses diffuse through each other, like perfume diffusing through the air in a room.

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