Friday, August 29, 2014

Frozen Alive

There are a couple creatures that can survive being frozen alive. One of them, the tardigrades, I will discuss next time.  But another one is the North American Wood Frog.

These little buggers are fascinating. When they feel a deep freeze approaching their body kicks into preservation mode by producing cryoprotectants.  It replaces all its glycogen with glucose and pumps urea through its body.  This limits the amount of water in its body that can actually freeze and form crystals which is what causes damage in cells.

The frog can be frozen to a solid state with no heartbeat, no breathing, and no brain activity. It can be left out to thaw, and then the heart will kick in on its own and start pumping again. 

Watch It Thaw

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