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Image: Nick Scott. As part of the human body's acute stress system , the "fight-or-flight" response works by stimulating the heart rate, dilating air passages, and contracting blood vessels—all of which increase blood flow and oxygen to the muscles, so we can be ready to run away from something life-threatening: a wild mammal, a fast car, a dangerous person. As physiological responses go, it's pretty important. Only, sometimes, we short-circuit a bit. Charles Darwin, who for years was reported to have suffered from crippling panic disorder that often left him housebound, argued that, to a degree, it is highly evolved to be "on alert" most of the time.
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