Membranes are held together by hydrophobic interactions
Proteins and lipids can move around laterally on one layer but rarely flip to the other side
Some move along the cytoskeleton fibers
Membrane remains fluid as temperature decreases until the phospholipids settle into a closely packed arrangement
Membrane remains fluid longer if there are more phospholipids with unsaturated hydrocarbon tails
Separated more because of the kinks in the tails
Cholesterol
At higher temperatures, it makes the membrane less fluid
Restrains phospholipid movement
Lowers the temperature required for membranes to solidify because they are packed less tightly
Temperature buffer
