1. Do you want me to diffuse?

2. TONICITY- REVIEW FROM LAST CLASS, PG 74-75 Tonicity refers to the strength of solution in relationship to osmosis. 3 terms to know: 1.Isotonic 2.Hypotonic 3.Hypertonic  The strength of solution will determine the direction water will move!

3. ISOTONIC SOLUTIONS iso = “the same” & tonic = “solution” concentration of solute outside cell is the same as the solute concentration in the cell water moves into cell at equal rate to water moving out cell stays the same, is at EQUILIBRIUM

4. HYPOTONIC SOLUTIONS hypo = “lower” solute concentration OUTSIDE cell = LOWER INTO More water outside cell  water moves INTO cell cell swells LYSIS –bursting may occur in animal cells TURGOR PRESSURE builds up in plant cells  Vacuole pushes outwards against cell wall

5. HYPERTONIC SOLUTIONS hyper= “ higher” solute concentration outside cell is higher water concentration is lower outside cell net movement of water OUT OF cell CRENATION occurs in animal cells PLASMOLYSIS occurs in plant cells

6. D) E) F) A) B) C)

8. HOW MIGHT THESE SITUATIONS RELATE?

9. How can we get this ring off? Can tonicity Help?

10. YOUR MISSION TODAY: Work on the critical thinking Qs using the tonicity vocab to EXPLAIN… Present your Cell Membrane Model to me Prepare for CHECKPOINT NEXT CLASS on: Cell Membrane, Diffusion, Osmosis

15. OSMOSIS LINKS http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm (tonicity) http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm http://ull.chemistry.uakron.edu/genobc/animations/collapse.mov (crenation) http://ull.chemistry.uakron.edu/genobc/animations/collapse.mov