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Cell membrane



Cell membrane

Definition : it is a protective sheath, and it is also known as plasma membrane, plasmalemma. This membrane separate ICF from ECF. it is a semipermeable membrane. Thickness of the cell membrane 75-111°A.

Composition of cell membrane :
  1. Protein - 55%
  2. Lipid - 40%
  3. Carbohydrate - 5%
Lipid layer of cell membrane : 
  1. Phospholipid.
  2. Cholesterol .
Protein layer of cell membrane :

1. Integral protein - that pass through entire thickness of cell membrane from one side to other side.
Example of integral protein:  
  1. Cell adhesion proteins.
  2. Cell junction protein.
  3. Some carrier or transport protein.
  4. Channel protein.
  5. Some hormones receptor.
  6. Antigens.
  7. Some enzymes.
2. Peripheral protein - are the partially embedded in the outer or inner surface of the cell membrane .
Example of peripheral protein :
  1. Proteins of cytoskeleton.
  2. Some carrier or transport protein.
  3. Some enzymes.
Functions of cell membrane :
  1. Protective function .
  2. Selective permeability .
  3. Absorptive function.
  4. Excretory function .
  5. Exchange of gases.
  6. Maintenance of shape and size of the cell.
  7. Transportation.


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