[Electron-microscopy analysis of the myocardium of rats developed in hypergravity].

The results of the quantitative electron-microscopy investigation of the left heart myocardium in rats continuously exposed to 2 G in the pre- and postnatal (75 days) ontogenesis evidence formation of a cardiac hystiocyte ultrastructure in support of the functioning of the left ventricle myocardium against chronically high blood weight. Mechanisms of the functional adaptation of cardiac hystiocytes to 2 G do not correspond to mechanisms observed by other authors in adult rats chronically exposed to hypergravity (2 G) which infers a better effectiveness of adaptation mechanisms formed in the course of pre- and postnatal ontogenesis.