推荐回答(1个)
如果是指月经,正常的话月经周期应该为28-30天
月经是生理上的 循环周期,发生在一些具有 生育能力的 女性人类和 黑猩猩与其他 人科动物之间。 母牛、 母马、母骆驼、 母猪、母羊等也会来月经,某些的 哺乳类动物则是经历动情周期。
育龄妇女和 灵长类 雌性动物,每隔一个月左右, 子宫内膜发生一次自主增厚, 血管增生、 腺体生长分泌以及 子宫内膜崩溃 脱落并伴随出血的 周期性变化。这种周期性 阴道排血或 子宫出血现象,称 月经。
青春期之前 卵泡基本上没有功能。到了青春期,在 脑垂体前叶 促性腺激素的作用下,不成熟的卵泡逐渐发育,同时合成 雌激素。
当卵泡发育成熟并排卵之后,卵泡壁塌陷,细胞变大、变黄,称为 黄体,它合成 雌激素的同时还产生 孕激素。
随着卵巢的变化,子宫内膜受其影响也发生相应的 周期性变化。雌激素使 子宫内膜增厚,内膜细胞增多、增大,间质内 小动脉变得愈加迂曲,呈螺旋状,称为增殖期子宫内膜。
排卵后,由于雌激素和孕激素的共同作用,子宫内膜发生 水肿, 腺体产生大量粘液及 糖原, 内膜厚度由1毫米增到6毫米,称为分泌期子宫内膜。
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