Base technology PhA is a mathematical model of the physiological systems of the human body. The development of this model started under the leadership of Yu.V.Solodyannikov in 70-90-ies of XX century. This model was developed as part of research on artificial heart, led V.I.Shumakov. The original version of the model described only the systemic circulation. As a result of development in the 90's model was included in the approach to the formalization of the regulation of contractile ability of the heart, which was developed in Amosov's School.

On the basis of this model, complex experiments was carried out in the Kuibyshev State University confirmed its agreement with the experimental data. In this model have been carried out research questions of identifiability, observability, controllability, stability.

Numerous medical and technical tests digital model (based on the Institute of Transplantation and Artificial Organs Medical Sciences of the USSR and the Samara Medical Institute) were carried out by simulating the various stationary and transient modes of the circulatory system of animals and man /Solodyannikov, Yu.V., Elementy matematicheskogo modelirovaniya i identifikatsii sistemy krovoobrashcheniya (Elements of Mathematical Modeling and Identification of Blood Circulation System), Samara: Samar. Univ., 1994 /. These tests have proved that the model has quite adequate homeostatic properties of a real body (the stability of the periodic motion, sensitivity to changes in the parameters, transients, etc.). All these properties of the model are well interpreted in the conventional terms of physiology and medicine. Digital model (normal avatar) is protected by the state registration certificates.

In the modern version of a mathematical model of the physiological systems of the body including the ideas and methods of the theory homeostatic systems, theory allometric parameters depending on the weight of the body (Allometric laws) intensively developed at present the theory of neural networks. Neural network analogy atrioventricular node of the heart, wire His-Purkinje system and the autonomic nervous system that controls the tone of the blood vessels used to build the model of neuro-humoral regulation.

Extending the model constructed by incorporating the equations describing the dynamics of metabolism (in particular the lactate and carbohydrates) in the human body. Also included is a mathematical model ergoreflektornyh control actions. Ergorefleksom skeletal muscle physiology is called the mechanism of regulation of the body, carried out through metabolic muscle receptors that respond to the accumulation of incompletely oxidized metabolites in muscle.

The modern version of the model and its a fairly complete description is available on the Internet in Russian and English languages. Meaningful description of the model equations, its classification and properties as a dynamic system in a strict mathematical form given in the recommended links.

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