Is it that every woman has a period?

Yes, unless the person who is called the stone girl does not menstruate. Because the female organs of the stone girl are defective, she doesn't menstruate, and she can't have children... Generally, normal women have to menstruate.

Not necessarily, if you are destined not to have children, there is a certain possibility that you will not come.

I don't know if the legendary stone girl will be.,But today's girls generally seem to start between the fifth grade and the second year of junior high school.,But a little later shouldn't necessarily be a problem.,If you're really worried.,Find a Chinese medicine doctor to take a look.。

Yes, every girl will have it when she grows up.

It should be, humanity needs to continue. If you don't come at the right age, you should have it checked, but it's normal for you to come late.

Biology class said that this is a female physiological phenomenon, and women do.

Women menstruate because the lining of the uterus goes through a process of shedding and repairing once a month, and this change in the lining of the uterus is innervated by the female hormones produced by the ovaries.

After puberty, follicles in the ovaries begin to develop, and usually only one follicle matures per menstrual cycle. The mature egg is discharged from the ovary to the abdominal cavity, and enters the fallopian tube through the synergistic action of the salopian tube, the peristalsis of the fallopian tube wall, and the activity of the ciliary activity of the lining of the fallopian tube, which is called ovulation.

The date of ovulation is about 14 days before the next menstrual period. Before ovulation, the developing follicle produces estrogen, a female hormone that thickens the lining of the uterus; After ovulation, the corpus luteum appears in the ovaries, which produces a progesterone that makes the already thickened lining of the uterus very soft. If conception is conceived at this time, the embryo grows on this thick, soft endometrium; If you don't conceive at this time, the corpus luteum shrinks about 10 days after it appears and stops producing estrogen and progesterone.

The thickened endometrium gradually shrinks, dies, sheds, and bleeds due to the loss of the role of female hormones, which is menstruation.

After menstruation, the wound of the endometrium grows, and a follicle in the ovary begins to mature again, ovulates, appears corpus luteum, and produces hormones, causing the endometrium to produce cyclical changes over and over again.

It is a periodic preparation of the endometrium for the implantation of a fertilized egg after a woman enters the reproductive period. Once no fertilized egg implants, the lining of the uterus shrinks and falls off, forming menstruation.

Because a woman is going to give birth to a baby, she has eggs, and because the eggs have to be released before conception, they bleed.

Metabolism, you know, women generally live longer than men There is also this partly reason.

Menstruation occurs due to bleeding from endometrial detachment.

The normal physiological phenomenon of digging is like the male will lose sperm when he reaches puberty

When you reach puberty, maybe one day, when you are defenseless, suddenly there is a red underneath you, and you are overwhelmed. That's menstruation.

Why do I get my period?

It turns out that when a girl is born, her ovaries contain about 400,000 immature eggs. With the onset of puberty, the ovaries release a mature egg every month under the action of sex hormones. At this time, the developing follicles produce estrogen and progesterone, which thickens the endometrium and prepares the fertilized egg for implantation.

If the egg is not fertilized, the hypertrophic endometrium loses its hormonal support, quickly sheds and bleeds, and then passes out of the body, which is menstruation. The arrival of menstruation is one of the signs of female sexual maturity, and it tells you: you have grown up!