Osmosis is the casual shift of solvent over a semipermeable membrane. When a cell occupies a hypotonic solution it will swell and enlarge till it blowout through cytolysis. When a cell occupies an isotonic solution, osmosis will not take place because the concentration of the solutes are the same. When water cross out of the cell if it occupies a hypertonic solution, it will be inelastic and it is called exosmosis. The high concentration of solute in a hypertonic solution makes this possible. Crenation of cells happen when a cell is placed in a hypertonic solution. Crenation happens in RBC. Cytolysis takes place when a cell is placed in a hypotonic solution when it swell and burst out. Plasmolysis is the reduction of a cell because of the shift of water out of the cell. It is the counterpart of osmosis. Turgor pressure is monitored by osmosis where it is the source of the growing of cell wall that results to subtle cell.