Biology 3466B Lecture Notes - Lecture 8: Osmotic Concentration, Osmotic Shock, Semipermeable Membrane
6 Mar 2020
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Osmosis: net movement water across semipermeable membrane by diffusion from solution of lesser solute concentration to solution of greater solute concentration. Van hoff equation: osmotic pressure depends on total number of all solute molecules which can be ions and non ions. Water moves readily in comparison with other molecules: small chances in osmotic properties cause most animal cells to swell/shrink. Isotonic: solute concentration similar to cell cytosol (no net movement) Hypertonic: solute higher than cytosol (water move out) shrinks. Hypotonic: solute lower than cytosol (water move in) swell. Aquaporins: water channel proteins that increase permeability tetramer with 4 identical subunits, each subunit form water channel pore: w/in channel, transported water molecules form h bonds w/channel-lining hydrophilic. Aa eg. frog oocytes transferred from isotonic salt solution to hypotonic salt solution. Osmolality of body fluids/tissue in animals: osmotic concentration measured in osmoles (corresponds to total molar concentration of solute particles, both molecules and ions)
