Say, a man announced - you have cancer.

And this plays a vital role sympathoadrenal system. It was hormones, adaptive mechanism allows a person (not everyone, of course) to survive the crash in cold water. And hit all that survived, while in seawater with a temperature of 6-8 degrees Celsius over the day, when it is well known that people in such water can not live longer than 2 hours. Or, you know that that's the whole geological expedition perished, and one of the geologists survived. Although all were equal. And all because the adaptive anti-stress mechanism is this gelologa was more powerful and verified than other people. Because all died, but he survived. Not for nothing because intelligence carefully and long in the making of their officers, especially officers, special forces. They are taught a lot of things, including and bring to perfection their adaptive (anti-stress) mechanism, to the extent that they learn to manage the activities of its organs and systems - to call and / or arrest the arrhythmia, long (much longer than ordinary mortals) to detain breath for much longer without food and water. All of our lives - a chain of constant stress and stressikov. Some have a good quality anti-stress (adaptation) mechanism, which negates all the consequences of these stresses, is able to balance, to reconcile the accuracy of the hormone (or hormone) and release them into the bloodstream, the excess of once a stressful situation is resolved, there was also inactivated. Talk about what stresses helpful or harmful - is like saying that eating is harmful or helpful. No food is harmful or helpful, and its quantity or quality. If there was no stress, then there would have been the most life. So what should be followed by stress? Of course - the reaction of the nervous system - the central and peripheral. And if the stress or prolonged his power was limitless ...? Then there are various neurological disorders, is scrapping the adaptation mechanism (again, not at all, again), and impairment of higher nervous activity. And as long as there is a "scrap" in the higher nervous activity, it, this same "sex" can not occur in other organs and body systems. And off we go ... here you and increased pototdelenie, and irritability, and dizziness, and ... insomnia. And where did without it ... Say, a man announced - you have cancer ... Some break down at once and burn like candles. Such a lot. Adaptive mechanism they arhislaby. Others seem to be something to begin to do sheburshitsya. But not for long and ... And die, too. Adaptation mechanism was stronger than the first, but not enough to survive. And the third ... And the third - after a brief experience triggered this most anti-stress (adaptation) mechanism, and the brain, and all the other structures of the adaptation mechanism begin to function in the "on demand". All the powers of the body are mobilized for survival. And these people recover. Recover and live long. Very long.