2006-09-15 06:44:15 · 7 answers · asked by ankita s 1 in Science & Mathematics ➔ Biology
Unless you freeze *very* fast, there is time for ice crystals to form... which are like little needles that rupture the cell membrane. It is very hard to freeze tissues fast enough to prevent this. Freeze very rapidly and the slight expansion associated with water expansion can be accomodated by the cell.
Aloha
2006-09-15 06:53:30 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Liquid expands when frozen. Cells have water as a major part of their content. Try filling a small plastic watertight bag with water and putting in the freezer. (Preferably in a bowl so it doesn't make a mess) and when the water freezes it should stretch or break the bag. Cells do the same thing.
2006-09-15 13:50:57 · answer #2 · answered by Shaun 4 · 0⤊ 0⤋
Because water expands as it's temperature drops from 4 to 0 dgs.. The delicate membrane etc tears..
2006-09-15 13:48:33 · answer #3 · answered by widow_twanky1 2 · 0⤊ 0⤋
The water in them expands as it freezes and the shards of ice pierce the cell walls.
2006-09-15 13:45:50 · answer #4 · answered by Anonymous · 1⤊ 0⤋
Water turns into ice which is very sharp (crystalline) and expands which damages cell walls.
2006-09-15 13:47:17 · answer #5 · answered by Anonymous · 0⤊ 0⤋
they contain water which expands
2006-09-15 13:46:15 · answer #6 · answered by crissyll22 4 · 0⤊ 0⤋
They're full of liquid
2006-09-15 13:45:41 · answer #7 · answered by Anonymous · 0⤊ 0⤋