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The Cell Membrane. All cells are separated from the external environment by a Plasma Membrane  Membrane is pliable and semipermiable only allowing certain materials in/out of cells. It is composed of many components. Phospholipids Cholsterol Proteins  Phospholipids

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the cell membrane

The Cell Membrane

All cells are separated from the external environment by a Plasma Membrane

 Membrane is pliable and semipermiable only allowing certain materials in/out of cells.

It is composed of many components.

Phospholipids

Cholsterol

Proteins

 Phospholipids

Very similar to triglycerides however, one of the fatty acid chains has been replaced by a very polar Phosphate group

phospholipids water
Phospholipids & Water
  • This poses a problem for the molecule since the molecule is both polar and non-polar simultaneously.
  • It is therefore very unstable in water, polar end is attracted to it, non polar tails are repelled by it.
  • This forces the phospholipids to take an arrangement such that their tails face each other. This accomplishes 2 things..
    • The polar heads can be adjacent to polar water molecules
    • The non-polar tails can be adjacent to each other.
the lipid bilayer
The Lipid Bilayer
  • As the layer enlarges it forms a bubble shape formed of a lipid bilayer which is the foundation of the plasma membrane
more membrane components
More Membrane Components
  • The membrane requires a few more components to make it complete:
  • Cholesterol
  • Functions to hold the membrane together like glue. Adds strength to the membrane.
  • Proteins (2 types)
  • Intrinsic Proteins
    • Extend into or through lipid bilayer
    • Often are channel proteins allowing large molecules in/out
  • Extrinsic Proteins
    • Exist only on surfaces of the bilayer
    • Often serve as receptor molecules
    • Glycoproteins serve as cellular markers (nametags)
the fluid mosaic model
The Fluid Mosaic Model
  • Entire model is referred to as the Fluid Mosaic model of the plasma membrane