| Term | Definition |
|---|
| Osmosis | Net movement of H2O down is conc grad, requires semi permeable membrane, water moves NOT the solute |
| Properties of Osmosis | H2O moves into an area of higher solute conc to dilute solute, if membrane is permeable to both substances then equilbrium will be met |
| Osmotic Pressure | Pressure exerted to prevent osmosis, depends on the NUMBER of particles to stop the net influx of water into the solution |
| Osomole | Number of particles in a solution that cause osmosis |
| Osmolality Example 1 | 1 Molar (M) of NaCl (fully dissociates = 1 M Na + 1 M Cl = 2 osmoles/kg H20 |
| Osmolality Example 2 | 1.5 M of Glucose C6H12O6= 1.5 M because glucose does NOT dissociate |
| Tonicity | the ability of a solution to cause osmosis across a cell membrane |
| Osmolality of Body Fluids | approx 300 mOsmoles/ kg of water |
| Flow of Osmosis | Osmosis moves water from a hypotonic (less solute) to a hypertonic (more solute) solution |
| Hypotonic Solution = less than 300 | cell is placed in in a solution that has more water in solute then cell therefore water moves in and causes cell to swell or burst |
| Isotonic= same | osmolality same within the cell and solute is is placed in (300) |
| Hypertonic Solution= more than 300 | cell placed in solution with higher solute concentration therefore water moves out of cell to dilute solution therefore cell skrinks or shrivels due to H2O leaving cell |
| Examples of Isotonic Solution | Cell placed in Solution A = 150 mM NaCl = 300 mOsmoles therefore ISOTONIC and no change to the cell |
| Example of a Hyertonic Solution | Cell placed in Solution B= 200kmM CaCl2= 600 mOsmoles therefore solution is HYPERTONIC and cell will skrink |
Combine with other sets
Share on Facebook
Share on MySpace
!