I am presently reading Mary Roach’s book “Grunt. The curious science of humans at war” All of her books have been good reads. However, I think Rule in particular might be interested in this one. I love her description of the fight or flight response:
“…..Whatever you wish to call it, here is a nice, concise summary, courtesy of Siddle: “You become fast, strong and dumb”. Our hardwired survival strategy evolved back when threats took the form of man eating mammals, when hurling a rock superhumanly hard or climbing a tree superhumanly fast gave you the edge that might keep you alive. A burst of adrenaline prompts a cortisol dump to the bloodstream. The cortisol sends the lungs into overdrive to bring in more oxygen, and the heartrate doubles or triples to deliver it more swiftly. Meanwhile the liver spews glucose, more fuel for the feats at hand. To get the goods where the body assumes they are needed, blood vessels in the large muscles of the arms and legs dilate, while vessels serving lower priority organs (the gut, for example, and the skin) constrict. The pre-frontal cortex, a major blood guzzler, also gets rationed. Goodbye, reasoning and analysis. See you later, fine motor skills. None of that mattered much to early man. You don’t need to weigh your options in the face of a snarling predator, and you don’t have time. With the growing sophistication and miniaturization of medical equipment, however, it matters very much to a corpsman. Making things worse, the adrenaline that primes the muscles also enhances their nerve activity. It makes you tremble and shake. Add to this the motions and vibrations of a medevac flight, and you start to gain an appreciation for the military medic’s challenges.”