为什么女人来月经会流血？

女性的月经是生殖系统周期性的自然现象，通常开始于青春期，每月定期发生一次。这个过程涉及到子宫内膜的脱落和排出，伴随着阴道流出的血液。然而，为什么女人来月经会流血呢？在本文中，我们将探讨这个问题并提供一些科学解释。

月经的过程可以追溯到女性生殖器官的内膜层。每个月，卵巢会释放一个卵子，这个过程称为排卵。如果没有受精，子宫内膜就会开始准备为一次新的受精做准备。当卵子没有受精时，卵巢会停止产生黄体素，这会导致子宫内膜开始脱落。这个过程被称为月经。

当子宫内膜脱落时，它将会伴随着血液一起被排出。子宫内膜富含血管，这些血管在脱落时会破裂，导致出血。这就是为什么女人来月经会流血的原因。

英文翻译对照：

Why do women bleed during menstruation?

Menstruation is a natural, cyclical process of the reproductive system in females that usually begins during puberty and occurs regularly once a month. This process involves the shedding and expulsion of the uterine lining, accompanied by the flow of blood through the vagina. However, why do women bleed during menstruation? In this article, we will explore this question and provide some scientific explanations.

The process of menstruation can be traced back to the innermost layer of the female reproductive organs, known as the endometrium. Every month, the ovaries release an egg, a process called ovulation. If fertilization does not occur, the uterine lining starts preparing for a new potential pregnancy. When the egg is not fertilized, the ovaries stop producing progesterone, leading to the shedding of the uterine lining. This process is known as menstruation.

As the uterine lining sheds, it is accompanied by the flow of blood. The endometrium contains numerous blood vessels that rupture during the shedding process, resulting in bleeding. This is why women experience blood flow during menstruation.

总结起来，女人来月经流血是由于子宫内膜的脱落和排出过程中血管的破裂所引起的。这是女性生殖系统正常周期性运作的一部分。虽然月经经历可能在不同女性间有所不同，但它通常是一个健康的生理过程。

In summary, the bleeding that occurs during menstruation in women is caused by the rupturing of blood vessels during the shedding and expulsion process of the uterine lining. This is a normal part of the regular cyclical functioning of the female reproductive system. While the menstrual experience may vary among different women, it is generally a healthy physiological process.