Effects of Osmosis on Life  Osmosis- diffusion of water through a selectively permeable membrane.  There are 3 types of solutions: Isotonic Hypertonic Hypotonic

Isotonic Solution  Solutions that contain the same concentration of solutes as the cytoplasm are called isotonic (or normal saline) solutions.  There is no net movement of water either into or out of the cell.  Cells maintain their normal shape. WATCH VIDEO OF BLOOD IN AN ISOTONIC SOLUTION

Isotonic Solution Isotonic: The concentration of solutes in the external solution is equal to the concentration of solutes inside the cell. Result: Water moves equally in both directions and the cell remains same size! (Dynamic Equilibrium) Osmosis Animations for isotonic, hypertonic, and hypotonic solutionsOsmosis

Hypertonic Solution  A hypertonic solution is a solution that contains more (hyper) solutes than the cytoplasm of the cell.  Has less water than the cell and water moves out of the cell.  The cells shrink. WATCH VIDEO OF NORMAL RBCs SUBJECTED TO A HYPERTONIC SOLUTION

Hypertonic Solution Hypertonic: The solution has a higher concentration of solutes and a lower concentration of water than inside the cell. (High solute; Low water) Result: Water moves from inside the cell into the solution: Cell shrinks (Plasmolysis/crenation)! Osmosis Animations for isotonic, hypertonic, and hypotonic solutionsOsmosis shrinks

Hypotonic Solution  A hypotonic solution contains less solute (thus, more water) than the cytoplasm of the cells.  The water will move into the cells resulting in the swelling and lysis of the cells. WATCH VIDEO OF CRENATED RBCs SUBJECTED TO A HYPOTONIC SOLUTION

Hypotonic Solution Hypotonic: The solution has a lower concentration of solutes and a higher concentration of water than inside the cell. (Low solute; High water) Result: Water moves from the solution to inside the cell): Cell Swells and bursts open (cytolysis)! Osmosis Animations for isotonic, hypertonic, and hypotonic solutionsOsmosis

Let’s take a closer look! 4/U04L06/rbc.html

What type of solution are these cells in ? A CB HypertonicIsotonicHypotonic