Cell Membrane Structure and Function

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Cell Memranes as partially permeable membranes 

  • They act to separate the contents of the cell from the exterior envrionment or an organelle from the rest of the cytoplasm (some organelles having their own membranes that act as barriers within them)
  • Some smaller molecules can easily diffuse between structural molecules 
  • Some substances dissolve in the lipid layer and pass through
  • Some substances can pass through protein channels within the membrane or can be transported by carrier proteins 

The properties of the components molecules of the membrane determine its permeability.

It is partially permeable as it only lets some molecules pass through.

Role of membranes on the surface

  • Separate cell

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