The development of the concepts of homeothermy and thermoregulation

The adjuncts to the existing determinations of homeothermy are made on the basis of available and new data, the principles of temperature adaptation of humans and homeothermal animals are given. The main purposes of the thermoregulation system of homeothermal animals and humans during various temperature excesses are formulated. The arguments are advanced in favor of the fact that in the thermoneutral zone the thermoregulation system goes from the principles of regulating the temperature homeostasis by one or several temperature points of a body to the regulation by the fluctuations of the total heat content of an organism, which increases the sensitivity and the accuracy of the thermoregulation system operation. The physiological mechanisms are described of determining (measuring) the total heat content of a body.