Transport in Cells

• Diffusion


  Net movement of particles from an area where their concentration is higher to an area where their concentration is lower
• Osmosis


  Specific type of diffusion in which only water molecules move, requires a partially permeable membrane
• Active transport


  Net movement of particles against a concentration gradient, requires energy
• Factors affecting diffusion rate


  • Concentration gradient
  • Temperature
  • Membrane surface area
• Concentration gradient


  Difference in concentration between two areas, the bigger the difference the faster the rate of diffusion
• Temperature


  The higher the temperature, the faster the rate of diffusion
• Membrane surface area


  The larger the surface area, the faster the rate of diffusion