1. By Chonell Peralta and Rosa Parra OSMOSIS AND DIFFUSION

2. WHAT IS OSMOSIS AND DIFFUSION? Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. Osmosis is the movement of water across a membrane in response to a solute concentration gradient.

3. WHY IS OSMOSIS AND DIFFUSION IMPORTANT? Adults have approx. 60% water 42 L Intracellular fluid =28L Interstitial fluid = 11 L Plasma = 3L Water is the solvent for all living matter

4. TONICITY Tonicity pertains to a solution and how it affects cell volume Hypertonic = solution makes cell shrink Hypotonic = solution makes cell swell Isotonic = cell does not change (optimal solution)

5. SURFACE AREA TO VOLUME RATIO Efficiency of a cell is based on its size

6. RATE OF DIFFUSION Nonpolar molecules diffuse rapidly Ions use protein channels Polar molecules use facilitated diffusion

7. PASSIVE TRANSPORT No energy is used for osmosis to occur Osmosis occurs by facilitated diffusion Protein channel is needed for diffusion to take place Aquaporins are used to diffuse water in and out of the cell