The Change of Immunity Under the Space and Microgravity Environment

Results of studies from several laboratories have indicated that during space flight immunity is greatly altered, such as atrophied thymus and spleen, depressed lymphocytes function. The mechanism of space influence is very complex and mainly involves two aspects : one is the change of neuroendoerine system, the other is the stucture and function alteration of immunocytes. Simultaneously, stress, radiation, noise, stress and many other yet undetermined factors in space flight maybe the causes of alteration of the immune system. Key words: Spaceflight;  Microgravity;  Immunity