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 It is a protective sheath of cell
 Exchanges material
 Facilitate interaction between cells
 Bilipid layer
 Thickness 7-10 nm
 Lipids 42%
 Proteins 55%
 Carbohydrate 3%
 Consists of double layered phospholipid
 Allows the flexibility of the membrane without
disturbing structural integrity
 Diffusion within the membrane is called
translational diffusion
 Effect of TEMPERATURE
 Role of CHOLESTEROL
At temp , cholesterol fluidity
At temp, cholesterol fluidity
 Creates permeability barrier
 Permeability depends on solubility
 Lipid soluble substance can pass through
membrane
Eg: oxygen & alcohol
 Water soluble substance cannot pass easily
Eg: glucose & urea
Membrane Proteins
o Integral
o Peripheral
 Functions of proteins
1. Serves as channel proteins
2. Act as carriers , serves as pumps
3. Antigenic , serves as receptor
4. Cell adhesion molecules
Membrane Carbohydrates
 Glycocalyx
Functions
• Serves as protective coat
• Selectins (permit temporary cell-to-cell adhesion)
• Integrins (permit strong cell-to-cell adhesion)
Special type
integral proteins
 Glycophorins
 Band-3 protein
Peripheral proteins
 Spectin
 ankyrin
cell membrane seminar.pptx

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cell membrane seminar.pptx

  • 1.
  • 2.  It is a protective sheath of cell  Exchanges material  Facilitate interaction between cells
  • 3.  Bilipid layer  Thickness 7-10 nm  Lipids 42%  Proteins 55%  Carbohydrate 3%
  • 4.
  • 5.  Consists of double layered phospholipid  Allows the flexibility of the membrane without disturbing structural integrity  Diffusion within the membrane is called translational diffusion
  • 6.  Effect of TEMPERATURE  Role of CHOLESTEROL At temp , cholesterol fluidity At temp, cholesterol fluidity
  • 7.  Creates permeability barrier  Permeability depends on solubility  Lipid soluble substance can pass through membrane Eg: oxygen & alcohol  Water soluble substance cannot pass easily Eg: glucose & urea
  • 8. Membrane Proteins o Integral o Peripheral  Functions of proteins 1. Serves as channel proteins 2. Act as carriers , serves as pumps 3. Antigenic , serves as receptor 4. Cell adhesion molecules
  • 9. Membrane Carbohydrates  Glycocalyx Functions • Serves as protective coat • Selectins (permit temporary cell-to-cell adhesion) • Integrins (permit strong cell-to-cell adhesion)
  • 10. Special type integral proteins  Glycophorins  Band-3 protein Peripheral proteins  Spectin  ankyrin