Drugs and toxic agent s may interferewith the appropriate utilization of folic acid andcause a megaloblastic anemia 药物与毒物在适当利用叶酸时,而可能引起巨成红细胞性贫血。
2.
The red blood cells of a normal person , for instance , age and die in 120 days . new blood cells are formed in bone marrow cells to ensure normal functioning of the human body . however , a vitamin b12 deficiency can make the red blood cells dysfunctional or prevent their successful formation , which in turn causes megaloblastic anemia anemia in which abnormally sized red blood cells are found in the blood . in some cases , prolonged vitamin b12 deficiency can deter the formation and functioning of myelin , subsequently leading to neuritis inflammation of the nerves or incomplete brain development 例如，人类正常的红血球每120天便会老化死亡，所以骨髓细胞会持续产生新的红血球，以维持人类正常之身体功能，所以如果缺乏维他命b12 ，便容易造成红血球生合成功能不全，进而导致巨大型红血球贫血megaloblastic anemia又例如，因长期缺乏维他命b12 ，会造成神经髓鞘myelin生合成功能不全，进而导致神经炎及脑部发育不全等等。
