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Transcript
Tonicity is a measure of the osmotic pressure (as defined by the water potential of the two solutions) of two solutions separated by a semipermeable membrane. Concentration- The amount of solute per unit of solvent. Osmosis is the flow of water down the concentration gradient (from an area of high concentration to an area of low concentration) Water never stops moving, even when equilibrium has been reached. The net movement of water across the semipermeable membrane is equal. The amount of water entering a cell is the same as the amount leaving the cell Isotonic Plant cells are Flaccid. Water never stops moving, even when equilibrium has been reached. There is more substances than water inside the cell. The concentration will try to even out. Water will enter the cell. This causes the cell to swell (get larger) until it may burst. Hypotonic Plant cells are Turgid. The Process of swelling animal cells is called hemolysis PUTTING A CELL IN PLAIN WATER There is less substances than water inside the cell. The concentration will try to even out. Water will leave the cell. This causes the cell to shrink (get smaller) Hypertonic Plant cells are Plasmolyzed. The Process of shrinking animals cells is called crenation PUTTING A CELL IN SALT WATER Concentration Water of (outside of Solute (outside cell) of cell) Net End Movement Product Isotonic Same as cell Same as cell None Hypotonic Less than cell More Cell gains than cell water Swells, turgor pressure Hypertonic More than Less Cell loses than cell water Shrinks plasmoly sis Tonicity of Solution cell None http://highered.mcgraw- hill.com/sites/0072495855/student_view0/c hapter21/animation__hemolysis_and_crenati on.html Lets watch a clip and answer questions about red blood cells in different solutions.