Membrane Fluidity
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A membrane's fluidity depends on how tightly its phospholipid tails pack, and unsaturated tails, kinked by double bonds, pack more loosely than saturated ones.
Show
A cold environment compresses membranes rich in saturated fatty acids toward rigidity; unsaturated tails hold space open to stay fluid.
Watch for
Fluidity is a property of the whole membrane's packing, not one phospholipid molecule alone.