diffusion

• Diffusion


  The movement of particles from high concentration to low concentration
• Net movement


  Overall movement
• Concentration gradient


  The difference in concentration between 2 areas
• Substances transported in and out of cells by diffusion

  • Glucose
  • Oxygen
  • Carbon dioxide
  • Urea
• Factors affecting the rate of diffusion

  • Surface area of the membrane
  • Temperature
  • Concentration gradient
• During diffusion, movement of particles is

  From high to low concentration
• Net movement


  Overall movement of particles
• Concentration gradient


  The difference in concentration between 2 places
• Heating up particles gives them more kinetic energy
• The steeper a concentration gradient, the faster diffusion occurs