threat response or fight-or-flight response. The effects of this activation are well-known. Just as a zebra reacts to the stress of being chased by a lion, the human body shoots adrenaline and cortisol (stress hormones) through its veins, and directs all its resources toward crucial functions: elevated heart and breathing rates, muscle reaction, vision acuity, and so forth. The body is no longer concerned with living ten more years, but with surviving ten more minutes. It shuts down nonurgent functions such as muscle repair, digestion, and the immune system, 6 as well as “superfluous”
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