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孕多少周开始有羊水产生
更新时间: 2020-11-04 00:00:00  

通常在怀孕8到10周左右,就会开始有羊水出现,而这时候的羊水主要是母体血清,经胎膜进入羊膜腔的透析液。到怀孕中期以后,胎儿的尿液就成为羊水的主要来源,这时候会使羊水的渗透压逐渐降低。而到怀孕晚期,胎儿的胎肺就会参与羊水的生成,一般每天会有600到800毫升的液体,从肺泡分泌到羊膜腔。同时羊膜以及华通胶,胎儿皮肤也会渗出少量液体成为羊水。

关键词: 多少 开始 羊水 产生

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