为探讨微重力下血液变化机理,观察了头低位兔血液红细胞形态及骨髓造血功能的变化,发现头低位组兔血液中的畸形红细胞增多,骨髓中出现了稍密集的造血细胞,网状细胞核孔增多,内质网扩张,幼稚红细胞进入血窦,巨噬细胞吞噬幼稚红细胞,血窦内皮细胞空泡化等现象.实验结果表明,短期模拟失重对红细胞形态和骨髓造血功能有一定的影响. In order to explore the mechanism of blood changes under microgravity, the change of blood erythrocyte morphology and bone marrow hematopoietic function in head low rabbits was observed. It was found that abnormal red blood cells increased in the blood of low head rabbits and slightly dense hematopoietic cells and reticular nuclei Increase of endoplasmic reticulum, infiltration of immature erythrocytes into blood sinusoid, macrophage phagocytosis of immature erythrocytes, vacuolization of sinusoidal endothelial cells, etc. The experimental results show that short-term simulated weightlessness has certain influence on erythrocyte morphology and bone marrow hematopoietic function.