The Fluidity of Membrane
• Most lips and some proteins drift laterally but
rarely flip-flop
&
-
Influenced by Temperature
• as temperatures cool, • Membrane fluidity is also influenced by
membranes switch from a the components of the membrane
FLUID to a SOLID
“ Fluidity buffer” for the membrane, Membrane Proteins
resisting changes in membrane fluidity as and Their Functions
temperature changes
-
-Two major types of membrane
proteins: Intergal & Peripheral
Integral proteins: Permanently embedded in
-Aquaporins: Specialized channel proteins the plasma membrane
that facility water passage through the Peripheral Proteins: Not embedded in
membrane the lipid bilayer
-Some transport proteins called carrier
proteins bind to molecules and change shape to
shuttle them across the membrane
Isotonic - equal inside + out
Hypertonic - higher concentration solutes ( water leaves cell and will sink )
Hypotonic - less concentration solutes ( cell will burst - Osmolarity )
• Most lips and some proteins drift laterally but
rarely flip-flop
&
-
Influenced by Temperature
• as temperatures cool, • Membrane fluidity is also influenced by
membranes switch from a the components of the membrane
FLUID to a SOLID
“ Fluidity buffer” for the membrane, Membrane Proteins
resisting changes in membrane fluidity as and Their Functions
temperature changes
-
-Two major types of membrane
proteins: Intergal & Peripheral
Integral proteins: Permanently embedded in
-Aquaporins: Specialized channel proteins the plasma membrane
that facility water passage through the Peripheral Proteins: Not embedded in
membrane the lipid bilayer
-Some transport proteins called carrier
proteins bind to molecules and change shape to
shuttle them across the membrane
Isotonic - equal inside + out
Hypertonic - higher concentration solutes ( water leaves cell and will sink )
Hypotonic - less concentration solutes ( cell will burst - Osmolarity )
