KINE 2011 Lecture Notes - Lecture 1: Membrane Transport Protein, Electrochemical Gradient, Cell Membrane
17 Oct 2017
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Membrane transport: unassisted membrane transport: tonicity: the effect the solution has on cell volume, the tonicity of the solution is determined by the concentration of the solution in nonpenetrating solutes (the penetrating ones are rapidly equally distributed between. Isotonic solutions: result in a constant cell volume: hypertonic solutions: tend to sell the cell, hypertonic solutions: tend to shrink the cell, osmolality: the measure of solute concentration per unit volume of solvent, not same as tonicity! Osmolarity (mol/l) involves total amount of solutes present. Molarity (mol/l) involves concentration of the compound as a whole: for instance: nacl once dissolved in water separates into na and cl ions. If nacl concentration is 200 mmol/l (mm) at the start; upon the dissolution in water molarity remains 200mm but osmolarity increases to. 400mosmol/l we must consider the total number of solutes in solution (i. e. separated ions: 200 mosmol/l of na+ and 200 mosmol/l of cl-)
