These three systems are in their features so closely related that even short-term cessation or suspension of operations of one of them results in a short time the same phenomenon in the other two, which in turn exposes the entire body of imminent death. Life of the organism depends also on the activity of many organs. You can not imagine living life to the man, whom for some reason, such as liver disappeared. Although the threat to life here is unmistakable, but the situation is much slower, threat of death is so sudden, when there is no appearance of disorder, but is odwleczona time. A large range of disorders in rise time allows the use of appropriate treatment, which is usually very intense, but not a rescue operation. Life-threatening because it is not direct. Termination of the acts of one of these three systems, because of their special role in the body, causing immediate – the immediate threat to life.