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Anonymous
>>174501
There was something on the Discovery Channel about that. Basically, when you're not in danger, the brain limits how many muscle fibers can fire off at the same time. When you are in danger, adrenaline activates some part of the brain that then travels back down as nerve impulses, telling all the muscle fibers to contract, thereby allowing the mother to lift the car off her infant. Why the body doesn't do this all the time is because it's a last ditch tactic to preserve life. They said all the fibers rip if they all contract at once, so that's why in normal situations only the minimal amount of fibers are used to get the job done.
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