Diffusion

    Cards (10)

    • Diffusion
      The gradual movement of particles from places where there are more of them to places where there are fewer of them
    • Diffusion happens in both solutions and gases
    • The bigger the concentration gradient (the difference in concentration)

      The faster the diffusion
    • A higher temperature

      Gives a faster diffusion rate because the particles have more energy and move around faster
    • Cell membranes
      • They hold the cell together
      • They let stuff in and out as well
    • Only very small molecules can diffuse through cell membranes
    • Small molecules that can diffuse through cell membranes
      • Oxygen (needed for respiration)
      • Glucose
      • Amino acids
      • Water
    • Big molecules like starch and proteins can't fit through the cell membrane
    • Particles flow through the cell membrane
      From where there's a higher concentration to where there's a lower concentration
    • The larger the surface area of the membrane

      The faster the diffusion rate, because more particles can pass through at once
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