2. * Water Concentrations * Movement of water molecules (H20) across a permeable membrane. * Molecules move from area of high concentrations to areas of low concentrations. * Aims to equalize concentration inside and outside the cell. * 3 Osmosis Situations * Isotonic * Hypotonic * Hypertonic

3. * Iso-equal * EQUAL amounts of water inside and outside the cell.

4. * Hypotonic more H20 molecules Outside the cell * Hypo-below, under, less * H20 molecules will move IN to the cell. * Cell takes on water

5. * more H20 inside cell/less H20 molecules outside cell. * Hyper-above, excessive * Cell loses H20 molecules. * Cell dehydrates