双语字幕
Fertilization and Menstrual Cycle
受精与月经周期
Normal Menstrual Cycle
正常月经周期
The brain makes the hormone GnRH which travels into the pituitary gland.
大脑产生激素GnRH，GnRH 进入垂体。
The pituitary gland then releases two hormones, FSH, follicle-stimulating hormone, and LH, luteinising hormone which travel in the bloodstream to the ovary.
然后，垂体释放两种激素：促卵泡生成素（FSH）和促黄体生成素（LH），它们随着血流进入卵巢。
These hormones cause about 6 to 12 follicles to be awake and start to mature. As they are going to mature, they release estrogen hormone, and cause the lining of the uterus to begin to build-up.
这些激素刺激约 6-12 个卵泡“觉醒”，并开始成熟。随着发育成熟，它们释放雌激素，导致子宫内膜开始增长。
Then one of those follicles tends to grow a little faster and becomes dominant. Then this dominant follicle moves to the edge of the ovary to produce an egg.
然后，其中一个卵泡往往生长得更快，称为优势卵泡。随后，这个优势卵泡移动到卵巢边缘产卵。
After the egg is released, the follicle then seals over and is called the corpus luteum.
卵子释放后，卵泡封闭，成为黄体。
The corpus luteum starts producing progesterone. This progesterone has a negative feedback effect on the GnRH to reduce it and keep its frequency in a normal range. Other follicles disintegrate in the next few days.
黄体开始产生黄体酮。黄体酮对 GnRH 产生负反馈作用，减少 GnRH 产生，将其频率保持在正常范围内。其他卵泡将在接下来的几天内分解。
This egg then travels to the uterus. If fertilized, it stays in the uterus, but if not fertilized, it will disintegrate after about 24 hours and the woman will have a regular menstrual period.
然后，卵子进入子宫。如果受精，它将留在子宫内，但如果未受精，它将在大约 24 小时后分解，女性将开始规律的月经周期。
Menstrual
Progesterone
