Six weeks after that moment, in a darkened classroom at Oceanside Community College, I would learn via an anger management class video about the cardiology, neurology, and endocrinology of rage—about how, as I reached for that wrench, my hypothalamus was instant-messaging my adrenal glands to secrete cortisol and adrenaline. How stored fat was dumping into my bloodstream for an energy turbocharge. How my heart was pumping overtime, sending a surge of blood to my muscles and lungs in preparation for what that instructional video called "the evolutionary miracle of fight-or-flight." That morning, I saw Hay and took the former option.
Source: wiktionary