[Age-related ultrastructural characteristics of various cells in acute hypoxia].

Ultrastructural peculiarities, concerning reaction of cells in various populations brain-sensorimotor cortex, mammillary nuclei, vascular plexus; myocardium; liver; jejunum) in mature (6-8 months) and old (24-30 months) male white Wistar rats have been studied at an experimental acute hypobaric hypoxic hypoxia. Both general changes, that are manifested in various degree in different cell groups and organo-specific ones are noted. The manifestation degree of the reactive changes is evidently connected with certain metabolic and functional peculiarities, as well as with the character of cell restoration. In the old animals hypoxic hypoxia produces more profound destructive processes in all cell populations studied. This is accompanied with a restriction in ability to adaptation.