Compostion and Functions of Cell membrane(2nd part)

              Protein and its types in cell membrane
-Proteins are the main components of cell membrane
-They play structural role in cell membrane
-They act as carrier or channal
                          Types of proteins
Singer group proteins:Singer group proteins are divided into two types.

• Periphral proteins:They are polar in nature.They are present at the sides of the cell membrane.
• Integral proteins:They are non-plar in nature and they are embeded in cell membrane.

Functions:Elasticity of the membrane is due to the presence of these protins.

-They reduce tension between cell and water.

-About all the enzymes are proteins.So their function is very important in the cell membrane.

-About 30 different enzymes are present in this cell membrane/

           Main functions of Cell membrane

-Control the flow of substances in and out to the cell

-Cell membrane have some pores tehy allow some molecules and prevent others,process call differentalialy permeable

-Permeablity is of fundamental importance ,it is mechanism which regulate the entrence of molecules,neccessry for photosynthesis.

       Fector affecting the Permeability 

1.Characteristcs of cell membrane:

 a.Fluidity:Fluidity means the number of unsaturated carbons.When fluidity increases then permeability increases.

b.Presence of pores:Permeablity also depends upon the size and the charge of pores.When number of opposite charge increases then permeability also increases.

c.Proteins:If essential proteins are not present then permeability decreaces,or cell membrane will not permeable.

2.Physical states:Permeability also depends upon 

• Temprature 
• PH
• Ion concentration
• concentration gradients