ess, because the body would still move in space, cross some kind of magnetic, gravitational or electric fields and interact with them. For this reason at present it is probably impossible in principle to get absolutely inert and inactive body. The integral organism represents mosaic of systems which are either in different stationary conditions, or in dynamic processes. One could possibly make an objection that there are no systems in stationary condition in the organism at all, as far as some kind of dynamic processes continually occur in some of its systems. During systole the pressure in the aorta increases and during diastole it goes down, the heart functions continuously and blood continuously flows through the vessels, etc. That is all very true, but evaluation of the system's functions is not made based on its current condition, but the cycles of its activity. Since all processes in any systems are cyclic, including in the organism, the criterion of stationarity is the invariance of integral condition of the system from one cycle to another. Aorta reacts to external influence (stroke/systolic discharge of the left ventricle) in such a way that in process of increase of pressure its walls 'tension increases, while it falls in process of pressure reduction. However, take, for example, the longer time period than the one of the cardiocycle, the integrated condition of the aorta would not vary from one cardiocycle to another and remain stationary.
Evaluation of functional state of systems. Evaluation may be qualitative and quantitative. The presence (absence) of any waves on the curve presents quality evaluation, whereas their amplitude or frequency is their quantitative evaluation. For the evaluation of functional condition of any systems comparison of the results of measurements of function parameters to those that should be with the given system is needed. In order to be able to judge about the presence (absence) of pathology, it is not enough to measure just any parameter. For example, we have measured someone's blood pressure and received the value of 190/100 mm Hg. Is it a high pressure or it is not? And what it should be like? To answer these questions it is necessary to compare the obtained result to a standard scale, ie to the due value. If the value obtained differs from the appropriate one, it speaks of the presence of pathology, if it does not, then it means there is no pathology. If blood pressure value of an order of 190/100 mm Hg is observed in quiescent state it would speak of pathology, while at the peak maximum load this value would be a norm. Hence, due values ​​depend on the condition in which the given system is. There exist standard scales for the estimation of due values. There exist maximum and minimum due values, due values ​​of quiescence state and peak load values, as well as due curves of functions. Minimum and maximum due values should not always correspond to those ...
