INTRACELLULAR REORGANIZATION OF RAT CARDIOMYOCYTES FOLLOWING TRANSFERTO HIGH-LATITUDES

It is shown that as soon as the Ist day after transfer to high latitud es, the regenerative processes are suppressed in some cardiomyocytes, this manifesting itself in lytic changes of the sarcoplasm and organel les in the perinuclear zone. After flight in the middle latitudes morp hological signs of disturbances in the processes of intracellular rege neration are observed only toward the end of the experiment. Intracell ular spatial reorganization of cardiomyocytes for transfer to high lat itudes and for flight in the middle latitudes has a stereotypic patter n and primarily manifests itself in an increase of the volume density of myofibrils and a decrease of this parameter for mitochondria.