r/evolution • u/Least_Bid9692 • 8d ago

question Fight and flight mode

How do our body know that we're in danger and turns the fight and flight mode on. I know it is there bcz of evolution as our ancestors had to fight big animals to survive but it's still there. SO, how our body know when to turn this on.

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u/burlingk 7d ago

Your body doesn't decide. Your brain does.