Rats were exposed to chronic normobaric hypoxia which the oxygen concentration decreased from 15%, 12%, 10%, 8% to 7% to study the pathological changes of the splenic tissues in chronic hypoxia. The hypoxic experiment continued for 112 dyas.

• 目的：探讨慢性低氧脾组织的病理学改变。 方法：将Wistar大鼠喂养在逐渐降低的常压低氧条件下，用氮气和空气的混合气体调节氧含量，氧浓度由常含量逐步降低为15%25，12%25，10%25，8%25，最后降为7%25，实验共进行112天。