Many of fans wondered how exactly Steve Rogers a.k.a. Captain America survived being frozen in ice for nearly 70 years in the MCU. Many of the fans assumed that it’s an outcome of the Super Soldier Serum, but it’s hard for others to understand that a man could survive in a frozen state for all those years only to be dug out and return to normal no matter of the superhuman modifications.
Now, Marvel has given a scientific explanation of how it has happened and it jumped up at the Avengers S.T.A.T.I.O.N. in Las Vegas of all places. A photo was posted on Reddit that provided a look at the explanation, and as you’ll see, it points to a biological phenomenon that’s usually only seen in animals.
Here’s what it says:
“Physical examination of Capt. Rogers revealed that while thickened, his blood’s water was not frozen. Blood tests revealed that his blood contained excessive amounts of glucose as a result of his liver processing his glycogen stores, thus lowering the freezing temperature of blood-borne water and creating a ‘cryoprotectant’. This process is similar to that of Water-Bears (Tardigrades) and hibernating Wood Frogs who metabolize glycogen in their liver to circulate copious amounts through their body to reduce the osmotic shrinkage of cells and stop from freezing. This, however, has never been seen before in humans.”
So thanks to the crazy high amount of glucose in Cap’s blood it wouldn’t freeze. It’s a form of hibernation and while this has never been seen in human before, this is clearly a result of the Super Soldier Serum that was inserted into Cap.
But it is a movie and movies are for fun not to conclude rational explanations from. Have fun!