Movement of Substances

Movement of Substances - Movement of Substances

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Movement of Substances There are a few concepts that need to be understood relating to the movement of  substances. class="bullet"> •   The movement of substances may occur across a semi-permeable membrane (such  as the plasma membrane). A semi-permeable membrane allows some substances to  pass through, but not others. •   The substances, whose movements are being described, may be water (the solvent)  or the substance dissolved in the water (the solute). •   Movement of substances may occur from higher to lower concentrations (down the  concentration gradient) or from the opposite direction (up or against the gradient). •   Solute concentrations vary. A solution may be  hypertonic  (a higher concentration of  solutes), hypotonic  (a lower concentration of solutes), or  isotonic  (an equal concentration  of solutes) compared to another region. •   The movement of substances may be passive or active. If movement is with the 
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Movement of Substances - Movement of Substances

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