When a cell freezes why does the cell membrane burst?

Question

When a cell freezes why does the cell membrane burst?

Answer 1

Because ice crystals form.  And when they form they grow linearly and grow so long it bursts the cell wall.  The target of research is how to introduce an antifreeze into all the cells of a body so when it's temperature is lowered sufficiently the cells are not damaged.

Answer 2

Well, first there's the membrane becoming more rigid due to the nature of the cholesterol and lipoprotein molecules when they become colder.  Also, the water in the cytosol expands when frozen due to the realignment of the water molecules into their solid form (taking up more volume)