Movement of across the Plasma Membrane:The Structure and Function of Plasma Membrane.

Posted on: February 16, 2011

Structure of Plasma Membrane


1. Most of the plasma membrane contains phospholipids in a lipid bilayer
         a. The polar ends are hydrophilic (dissolve in water easily) while the
              fatty acid tails are hydrophobic (dissolve in water with difficulty). 
     2. Plasma membrane is more structurally complex than a lipid bilayer.
          a. Numerous proteins are imbedded in the lipid bilayer that have 
              many different functions.  
               1)  act as ion channels, as in nerve function
               2)  act as a receptor for a hormone/neurotransmitter
               3)  are carrier molecules for specific substances
               4)  docking proteins for vesicle identification
               5)  glycoproteins are markers for cell-cell identification.
     3. Cholesterol embedded in the membrane provides membrane fluidity.


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