CELL MEMBRAN (STRUCTURE OF THE CELL MEMBRAN)
BY MUHAMMAD ASWAN
Definition of The Cell Membran
Cell Membran is the layer to separate that a cell with the other cell as well to separate into cell the organell
The General of Component Cell Membrane
Components of The Cell Membran a. The major constituens of tha
cell membran are lipid and protein
b. Membran Protein and Lipid are arranged in particullary fashion, both contribution to containt the cell and to selectively allowing or blocking the traffic of certain substance of through the cell
c. Such arrangement of molecules provides fluidty to cell membrane
Components of The cell Membran : Lipid
a. Phospholipid are amphiphatic molecules (with hydrophobic tail and hydrophilic head)
b. One of phospholipid tails exits mostly in a trans configuration providing more fluidity to the membrane
c. Cholesterol is a rigid molecule that makes membrane less fluid.
How Are Phospholipid Organized in the Cell Membran ?
a. Phospholipid constitute two mirror – image oriented layer – the lipid bilayer
b. The hyrdrophilid heads are exposed to the high content water region, while the hydrophobic tails constitute a barrier imprenetable to almost all substance
Components of the Cell Membrane : Membrane Protein
a. Membrane Protein are embedded in the fluid matrix of lipid bilayer.
b. More than 50 types protein have been found in the plasma. Membrane protein determine most of the membrane specific function.
c. Transport membrane, enzymes and receptor protein (membrane protein that interact with the other cell or molecules) include the vast majority of membrane protein.
Fluid Mosaic Model a. Fluid – because
individual phospholipid and proteins can move side –to – side within the layer, like it’s a liquid
b. Mosaic- because of the pattern produced by the scattered protein molecules when the membrane is viewed from above.
Semipermeable Membrane
Small molecules and larger hydrophobic molecules move through easily. e.g. O2, CO2,
H2O
Semipermeable Membrane
Ions, hydrophilic molecules larger than water, and large molecules such as proteins do not move
through the membrane on their own.
Function of Cell Membrane
a. Provide a binding site for enzymesb. Interlocking surfaces bind cell
together (junction)c. Contain the cytoplasm (fluid in
cell)d. Protective barriere. Regulate transport in & out of cell
(selectively permeable)f. Allow cell recognitiong. Provide anchoring site for
filament of Cytoskeleyon
SEKIAN DAN TERIMA KASIH
