【摘要】 失重飞行后航天员的超重耐力是下降的，为了探讨超重耐力下降的机理，因而观察了正常兔（ｎ＝１０）和模拟失重兔（ｎ２１４）在－４Ｇｘ离心机上作用３ｍｉｎ后脑、心、肺、肾四个脏器微血管和组织形态学的变化。结果是正常兔在－４Ｇｘ作用后四个脏器的微血管和小静脉充血，肺动脉充血，出现肺不张和肺扩张。模拟失重兔－４Ｇｘ作用后，以上变化较正常组明显加重，肺、心部位有明显出血症状。结果提示失重后超重耐力下降与失重所引起的组织形态学变化有关。更多还原

【Abstract】 The g tolearance of astronaut after space flight decrease.In order to study the mechanism of decrease of g tolearance,the morphological changes of brain,heart,lung and kidney in control rabbits(n=10) and simulated weightlessness(SWL) rabbits were observed after-4Gx stress.The results showed that the congestion in microvessel and veinlet of four organs,congestion of pulmonary artery,pulmonary emphysema and drowned lung were appearance in control rabbits after -4Gx stress.The morphological change in SWL rabbite after -4Gx stress liked the changes in control,but more serious and hemorrhage in pulmonary and myocardium appears.The results indicated the the decrease of g tolerance after space flight is associated with the morphological changes caused by weightlessness.更多还原