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Lab 3 diffusion and osmosis fall 2014

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Diffusion Osmosis
Diffusion Osmosis
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Lab 3 diffusion and osmosis fall 2014

  1. 1. Diffusion and Osmosis Kidney Dialysis Simulation Lab #NSB2014 1
  2. 2. After completing this activity, students will be able to:  Define the terms diffusion, osmosis, hypotonic, hypertonic, isotonic  Construct a model to simulate the action of a kidney  Relate changes in color, turgor, and salt concentration to evidence of osmosis  Evaluate the function of the kidney as an evolutionary adaptation to life on land. #NSB2014 2
  3. 3. Think about the diffusion of…  Molecules Perfume Smells and Gases Sugar in iced tea A drop of food coloring in water #NSB2014 3
  4. 4. Diffusion: High concentration to low concentration #NSB2014 Diffusion is passive – doesn’t require any energy 4
  5. 5. Perfume molecules expand to fill all the space (because they are in motion) #NSB2014 5
  6. 6. Semi permeable membrane – allows certain molecules to diffuse through it Small molecules fit through the membrane, larger ones do not #NSB2014 6
  7. 7. Osmosis  The spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides #NSB2014 7
  8. 8. Turgor Pressure – internal cellular pressure A B C D #NSB2014 8
  9. 9. Water (osmosis) balance in cells 9 #NSB2014 The outside of a red blood cell is a semi permeable membrane
  10. 10. What affects the rate of diffusion?  Temperature  higher temperature = faster diffusion  Adding energy  (when you stir sugar into your coffee, does it dissolve faster or more slowly?) What affects rate of diffusion across a semi-permeable membrane?  Difference in concentration of a substance inside vs. outside the membrane –> bigger difference = faster diffusion #NSB2014 10
  11. 11. Vocabulary to know  Isotonic – water enters and leaves at same rate (equilibrium, balance, homeostasis)  Hypertonic – salt water (what would happen to your body if you ate too much salt?)  Hypotonic – distilled water (what would happen to your body if you drank too much water?) #NSB2014 11
  12. 12. Vocabulary to know #NSB2014 12
  13. 13. Could we put a salt water fish like a clownfish in a freshwater fish tank with a goldfish? #NSB2014 13
  14. 14. Today’s Lab: Simulated Kidney #NSB2014 14
  15. 15. Why are we going to talk about Kidneys? • Metabolism, Homeostasis • All the blood in the body must pass through the kidneys. • Kidneys filter all waste out of your body (urea, ammonia, salts, drugs, water, and other toxic substances) • If you have no kidney function, you have to get dialysis, or you will be poisoned with waste. #NSB2014 15
  16. 16. Kidney Dialysis #NSB2014 16
  17. 17. What is Dialysis Tubing?  Dialysis Tubing is a type of semi-permeable membrane tubing made from regenerated cellulose (plant material) or cellophane. It is used for diffusion. It allows the passage of small molecules but not larger ones. #NSB2014 17
  18. 18. Biological Processes #NSB2014 18
  19. 19. Things that affect diffusion #NSB2014 19

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