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puberty

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星期四, 19 11月 2009 15:34

正常的出血类型

月经

子宫衬里,称为子宫内膜,在每个月经周期会因雌激素而增厚。孕激素水平在排卵时开始上升,使子宫内膜发生变化,从而为受精卵的移植做好准备。如果没有怀孕,孕激素和雌激素水平会下降,导致子宫内膜脱落。

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