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正常机体外周血液中的细胞成份处于不断生成和破坏的动态平衡状态。如以70公斤的成人,每天约有2.1×10~(11)个红细胞,6×10~(10)个粒细胞,1.8×10~(11)个血小板死亡,同时约有各类相同数量的血细胞由骨髓生成补充。而维生素B_(12)(下称B_(12))、叶酸是影响造血细胞增殖的重要因素,
The normal body of peripheral blood cells in the constantly generating and destroying the composition of the dynamic equilibrium. For example, in 70 kg adults, there are about 2.1 × 10 11 red blood cells, 6 × 10 10 granulocytes, and 1.8 × 10 11 platelets per day. At the same time, there are about the same number of Blood cells are produced by the bone marrow. The vitamin B_ (12) (hereinafter B_ (12)), folic acid is an important factor affecting the proliferation of hematopoietic cells,