人类在进化及个体发育的过程中,已经完全适应1g的重力环境。人类在失重状态下长期停留,身体各器官的机能、代谢及结构必然发生变化,尤其是骨骼系统。而宇宙航行中最重要的环境特征之一就是失重。宇宙航行的失重状态使尿钙的排泄增加,肠内钙的吸收下降,血清钙水平升高,血清甲状 Human evolution and individual development in the process, has been fully adapted to 1g of gravity environment. Long-term human stay in the state of weightlessness, the body’s organs function, metabolism and structure is bound to change, especially the skeletal system. One of the most important environmental characteristics of astronautics is weightlessness. Loss of state of astronautics make urinary calcium excretion increased, decreased intestinal absorption of calcium, elevated serum calcium levels, serum thyroid