The cell membrane is composed of a lipid bilayer with embedded proteins. It separates the interior of the cell from the external environment. The major components of the cell membrane are lipids and proteins. Phospholipids form the lipid bilayer, with their hydrophobic tails facing each other and hydrophilic heads facing outwards. This arrangement forms a selectively permeable barrier. Membrane proteins are embedded in the lipid bilayer and perform functions like transport, signaling and enzymatic activity. The fluid mosaic model describes the cell membrane as a fluid structure with proteins scattered within the phospholipid bilayer. The cell membrane regulates what enters and exits the cell and also performs other roles like cell adhesion and protection.

1. CELL MEMBRAN
(STRUCTURE OF THE CELL MEMBRAN)
BY MUHAMMAD ASWAN

2. 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

3. The General of Component Cell
Membrane

4. 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

5. 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.

6. 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

7. 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.

8. 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.

9. Semipermeable Membrane
Small molecules and larger hydrophobic
molecules move through easily. e.g. O2, CO2,
H2O

10. Semipermeable Membrane
Ions, hydrophilic molecules larger than water, and
large molecules such as proteins do not move
through the membrane on their own.

11. Function of Cell Membrane
a. Provide a binding site for
enzymes
b. Interlocking surfaces bind cell
together (junction)
c. Contain the cytoplasm (fluid in
cell)
d. Protective barrier
e. Regulate transport in & out of
cell (selectively permeable)
f. Allow cell recognition
g. Provide anchoring site for
filament of Cytoskeleyon

12. SEKIAN DAN TERIMA KASIH