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铅是一种常见的工业毒物,对其毒性,人们进行了多年的研究,了解了对接触者的各种危害,随着科学技术的进步,人们现在认识到,职业接触铅以后,可以对人类的生育机能造成影响,并对第二代的健康产生危害。铅可以通过胎盘转运对发育中的胚胎产生毒理学作用,胎盘屏障是母体血循环和胎儿血循环间的一层分隔膜,人类的胎盘屏障早期由四层构成。①胎儿血管内皮层。②绒毛中心的结缔组织。③细胞滋养层。④覆盖绒毛表面的合体细胞层。外源性化学物质通过胎盘转运对胎儿的影响大致可有两种情
Lead is a common industrial poison, its toxicity, people conducted years of research to understand the various hazards to contacts, with the progress of science and technology, people now realize that occupational exposure to lead, you can human Of the reproductive function of the impact, and the second generation of health hazards. Lead can produce toxicological effects on developing embryos via placental transport. The placental barrier is a separate membrane between the maternal blood circulation and the fetal blood circulation, and the early human placental barrier consists of four layers. ① fetal vascular endothelial cells. ② villous center of connective tissue. ③ cytotrophoblast. ④ cover the villus surface of the body cell layer. Exogenous chemicals through the placenta transplants on the fetus can have two kinds of affections