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维生素 B_(12)随食物进入体内,在胃内与内因子即胃粘蛋朊结合进入肠道后被释出,与载体结合,在肠道毛细管内又从载体释出,大部分同血浆蛋白结合貯存于肝脏,部分呈游离状态由尿中排出。维生素 B_(12)对于核甙合成起触媒作用,后者为血球形成过程中所必需的,B_(12)在合成及利用遊离的甲基起主要作用,这对白血球形成过程是很重要的。并具有脂肪形成的作用,参与甲硫胺的合成,稳定胆硷的作用,调节蛋白质的代谢,对恶性贫血有高度的疗效。苯是属于血液毒的一种,慢性苯中毒时能够引起骨髓造血机能和血液形态上的障碍,以及血清中 B_(12)含量降低。
Vitamin B_ (12) with the food into the body, in the stomach and internal factors that gastric mucoid protein into the intestine after the release was combined with the carrier in the intestinal capillary and release from the carrier, most of the same plasma protein Combination of stored in the liver, some were discharged from the urine. Vitamin B 12 plays a catalytic role in the synthesis of nucleosides, which is necessary for the formation of blood cells. B 12 plays a major role in the synthesis and utilization of free methyl groups, which is important for the formation of leukocytes . And has the role of adipogenesis, involved in the synthesis of methylthiamine, the role of stabilizing choline, regulating protein metabolism, has a high effect on pernicious anemia. Benzene is a kind of blood poisoning, chronic benzene poisoning can cause bone marrow hematopoietic function and blood morphological obstacles, and serum B_ (12) content decreased.