Diffusion

• Diffusion

  The net movement of particles from an area of higher concentration to an area of lower concentration
• Diffusion

  1. Molecules move about randomly

  2. Molecules spread out over time

  3. Molecules become evenly distributed
• Diffusion can happen in both gases and liquids
• Partially permeable membrane

  Only some molecules can diffuse through, like water, glucose, and amino acids, while larger molecules like proteins and starch cannot
• Diffusion is a passive process that does not require energy from the cell
• Factors affecting rate of diffusion

  • Concentration gradient
  • Temperature
  • Surface area
• Larger concentration gradient

  Higher rate of diffusion
• Higher temperature

  Higher rate of diffusion
• Larger surface area

  Higher rate of diffusion