[Blood supply as a factor regulating pacemaker activity of the rat uterine horn].

Effect of ischemia of the uterine artery supplying with blood the main rhythmogenic zone (the ovarian region) of the uterine horn on parameters of activity both of this locus and of all subsequent pacemaker areas up to the uterine cervix was studied in non-pregnant rats. The most pronounced changes in characteristics of the activity (amplitude, frequency, and burst genesis duration) were revealed in the ovarian horn end. The uterine corpus and the horn cervical end were less affected by ischemia. Meanwhile, under these conditions, amplitude of the slow-wave oscillations rose more than 1.5 times. The obtained data allow us to conclude about the presence of a certain connection between the horn ovarian end and the uterine cervix. Morphological studies have revealed strong vascularization of the upper part of uterine horn.

[Reaction of the brain capillaries to hypoxia in cats]. / Reaktsiia kapilliarov mozga koshki na gipoksiiu.

Using calcium-adenosinetriphosphate histoangiological method of Chilingarian, the morpho-functional characteristics of capillary section of microcirculatory bed were studied in cat's brain and dura mater following experimental hypoxia. Analysis of morphometric data has shown that short-term hypoxia resulted in dilation of brain capillary lumen by 15% in comparison with that in intact animals. Average diameter of dura mater capillaries was found to vary within the limits of control values. Dilation of brain capillaries should be considered as a compensatory-adaptational change aimed at maintenance of metabolic regulation of cerebral circulation.

[Myocardial capillary bed in the cat after exposure to obsidan]. / Kapilliarnoe ruslo miokarda koshki pri vozdeistvii obzidana.

In studying the effect of physiologically active substances and pharmacological drugs the response of hemomicrovessels is of special interest. Calcium-adenosine-triphosphatase method reveals all the branches of the organ hemomicrocirculatory bed simultaneously and the possibility to carry out a combined pharmacological and histoangiological study of intraorgan vascular bed is obtained. During the study on the obsidan effect on myocardial vascular bed of the cat it was established that obsidan causes major vessels dilatation and capillary constriction.