Wood frogs can survive being frozen solid each winter by producing glucose and urea that act as natural antifreeze, protecting their cells from damage as ice crystals form; this controlled hypothermia allows their heart and lungs to stop beating for months, and they can fully revive when spring arrives.
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Frogs can survive being frozen solid #ShortsAdded:
The wood frog freezes solid each winter.
Its body temperature drops to 20 below zero.
Ice crystals [music] form inside its blood and organs. Its heart stops beating. Its lungs stop breathing. For months it's completely frozen. [music] Imagine that. Then spring arrives and the ice melts.
The frog's heart begins to beat again.
Its brain sparks back [music] to life.
It opens its eyes. It stands up and hops away.
Biologists call this controlled [music] hypothermia. The frog produces glucose and urea that acts like natural antifreeze.
They protect its cells from tearing apart as ice crystals form. No other vertebrate can survive this. Frogs do [music] it every year and somehow they walk away from it.
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