[Ultrastructure of the blood vessels and muscle fibers in the skeletal muscle of rats flown on the Kosmos-605 and Kosmos-782 biosatellites].
Electron microscopy was used to study ultrastructures of the wall of blood vessels and muscle fibers of the red (soleus) and mixed (gastrocnemius) muscles of rats flown on Cosmos-605 for 22.5 days and on Cosmos-782 for 19,5 days and sacrificed 4-6 hours, 48 hours and 25-27 days postflight. It was demonstrated that the orbital flight did not induce significant changes in the ultrastructure of blood vessels of the soleus and gastrocnemius muscles but caused atrophy of muscle fibers and reduction of the number of functioning capillaries. Readaptation of the soleus vascular system to 1 g led to degradation of permeability of capillary and venular walls and development of edema of the perivascular connective tissue. This may be one of the factors responsible for dystrophic changes in muscle fibers.
D000818:Animals; D008833:Microcirculation / Q000648:ultrastructure; D008854:Microscopy, Electron; D009132:Muscles / Q000098:blood supply* / Q000648:ultrastructure*; D009336:Necrosis; D051381:Rats; D013026:Space Flight; D013997:Time Factors; D014586:USSR; D014893:Weightlessness / Q000009:adverse effects
Ul'trastruktura krovenosnykh sosudov i myshechnykh volokon skeletnykh myshts krys, éksponirovannykh na biosputnikakh "Kosmos-605" i "Kosmos-782".