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胎儿的成长靠胎盘吸收母体营养,婴儿出生后靠母乳哺育,因此,母体的健康、营养状况及母亲的生活环境都会影响下一代的健康。 有些化学物质能通过胎盘对胎儿产生一定毒作用。例如,很早以前人们就知道铅是一种堕胎药物,接触铅的女工有的会发生月经不调、闭经、流产等。有人作过研究,铅中毒的孕妇,血铅为0.1mg/100ml时,脐带血的铅含量可达0.065mg/100ml,当孕妇的尿铅为0.1mg/l时,新生儿的尿铅也达每0.1mg/l。目前已经发现多种化学物质均能通过胎盘进入胎儿体内,其中一部分有毒物质当达到一定量时对胎儿可能产生不同程度的影响,如流产、早产、死胎、先天畸型、胎儿生长迟缓及功能发育不全等。
Fetal growth by the mother to absorb the placental nutrition, breastfeeding the baby after birth, therefore, maternal health and nutritional status and the mother’s living environment will affect the next generation of health. Some chemicals have a toxic effect on the fetus through the placenta. For example, people long ago knew that lead was an abortion drug. Some women exposed to lead could experience irregular menstruation, amenorrhea, and miscarriage. It has been studied, pregnant women lead poisoning, blood lead 0.1mg / 100ml, umbilical cord blood lead up to 0.065mg / 100ml, when pregnant women urine lead 0.1mg / l, the newborn urine lead up to Every 0.1mg / l. It has been found that a variety of chemicals can enter the fetus through the placenta, some of which when toxic substances may have varying degrees of impact on the fetus, such as miscarriage, premature birth, stillbirth, congenital abnormalities, fetal growth retardation and hypoplasia Wait.