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妊娠

妊娠是新个体产生的过程,包括受精、着床、妊娠维持、胎儿成长以及分娩。
受精。精子与卵子在输卵管壶腹相遇而受精,在上亿的精子中只有200个左右能接近卵子,一般来说,其中只有一个能与卵子结合而受精。这说明在精子与卵子的运输过程中发生了许多复杂的变化。从精子方面来说,进人阴道的精子绝大部分很快被阴道内的酶杀伤失去活力,存活的精子随后又遇到子宫颈粘液的拦截。子宫颈粘液在月经中期,受雌激素的刺激时,液体清亮透明,精子通过的可能性较大,其它时间则难以通过。有些精子又因精液始终保持胶体状态而不液化,也失去活力。少数的精子靠本身的运动及受精后引起的子宫收缩,才被送至子宫,进入输卵管,与卵子相遇。从卵子来说,它达到输卵管,也要经历一段复杂的过程。首先,输卵管伞端要顺利地汲取卵子;其次,输卵管平滑肌及上皮细胞纤毛的活动,在时间与强度上必须适合;还有,卵子外面的卵反细胞、放射冠、透明带及卵黄膜均应处于良好状态,否则,运行将发生困难。
若一切情况适合,精子与卵子在壶腹部相遇,在相互靠近,即将接触的一瞬间,精子顶体中的酶系便释放出来,称为顶体反应。
受精卵在运行至子宫途中,一面移动,一面进行细胞分裂,形成胚泡;约1周左右,胚泡进入子宫,胚泡的运行需维持雌激素与孕酮的适当比例,才能正常进行。
着床。是胚泡通过与子宫内膜相互作用而植入子宫的过程。