Yes. Adrenalin. Lots of it.
AKA epinephrine, adrenaline, or 4,5-β-trihydroxy-N-methylphenethylamine.
It is a hormone and a neurotransmitter. Among functions in the body like regulating heart rate, blood vessel and air passage diameters, metabolic shifts, the release of adrenalin is a crucial component of the fight-or-flight response of the sympathetic nervous system.
Fight-or-flight is sort of hardwired in our reptilian brain. The adrenalin rush helps to make a fast decision whether to tackle an acute threat or to run away from it. Very usefull in actual physical danger when there is no time to sit down, have a nice cup of tea and think about the problem.
Not so usefull in modern time situations like ‘my boss is yelling at me’. See also: stress related illness/disorder.
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