title: [Mathematical modeling of passive mechanisms of the human vascular regulation in orthostatic position].
abstract: Formalized description of the vascular component of the human circulation system taking in the effects of gravity on the human organism during the standing test is presented. The structure proposed in the model by R.D. Grigorian has been used as basic to describe the vascular system. The neuroreflex and humoral regulators of circulation have been counted as constant. Organs and elements of the vascular system were represented as a network of sequential and parallel separate elastic reservoirs with distributed parameters. The pressure-volume ratio was represented by piecewise linear approximation with 3 fragments imitating main forms of the vascular cross section. Primary focus was put on investigation of circulation in the leg and the head which is of interest for evaluating body reactions to postural changes. Result of modeling have been displayed as curves of volumetric velocity, and blood volume and pressure in different fragments of cranial and crus vessels.
authors.forename: V S
authors.initials: VS
authors.lastname: Bednenko
authors.forename: T V
authors.initials: TV
authors.lastname: Matiushev
authors.forename: V A
authors.initials: VA
authors.lastname: Mukhin
authors.forename: S P
authors.initials: SP
authors.lastname: Ryzhenkov
authors.forename: V Iu
authors.initials: VIu
authors.lastname: Abashev
mesh_terms: D001808:Blood Vessels / Q000502:physiology*; D004244:Dizziness; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D011187:Posture / Q000502:physiology