Definition Isotonic, hypotonic, hypertonic, isosmotic?
isotonic: no net movement of fluid into or out of cell
hypotonic: lower tonicity causing net movement of fluid into a cell; cell in hypotonic soln will swell
hypertonic: higher tonicity causing net movement of fluid out of a cell; shrivel cell
isosmotic: equal concentrations of osmotically active particles across a semi-permeable membrane