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Unformatted text preview: SOLUTES REDUCE WATER POTENTIAL-solutes bind to water molecules, reducing the amount o MOLARITY VS. OSMOLARITY-molelcules that do not ionize in water: o molarity=osmolarity o e.g. glucose 1M=1osM-Molecules that ionize in water: o Molarity<Osmalarity o E.g. RED BLOOD CELL-cellular content is complex-both soluble and insoluble substances (matrix) in cell can reduce water potential-human red blood cell has about -0.3 osM of solute and matrix (Psi=/about .7Mpa) MEMBRANE STRUCTURE RESULTS IN SELECTIVE PERMEABILITY-a cell must exchange materials with its surroundings, a process controlled by the plasma membrane-in general hydrophobic molecules pass through membrane more easily than hydrophilic molecules...
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- Fall '09