How powerful does adrenaline make us as humans?
 

You read stories once in awhile about humans lifting cars off of people because their adrenaline kicks in. Or people having super speed or being able to run faster and longer. I also read a story of a 40 year old lady in Alaska who seen a polar bear going after her 2 sons and charged after it, "wrestled" with it and held it off long enough for a guy to shoot it dead. Do you think when our lives or someone elses life is in danger adrenaline kicks in and causes our bodies to do things that we normally wouldnt be able to do in every day society?

Yes. That's what adrenaline does. It's like "push to pass" for humans.