Knowledge about why women menstruate

　　Knowledge about why women menstruate. Many times we wonder why girls menstruate but boys don’t, and there is so much blood during menstruation. Why is there still blood in the body? These questions accompany the girl from a little girl to a mother. When her daughter menstruates, she is really at a loss, but she is a mother, so she must understand some basics of menstruation. common sense。

　　Common sense about menstruation must first be understood female Only the structure and physiological functions of reproductive organs can explain this problem. The female internal reproductive organs consist of the ovaries, Uterus , Fallopian tube formation. The main function of the ovaries is to produce eggs and synthesize ovarian hormones. The uterus and fallopian tubes are reproductive organs. The ovaries contain hundreds of thousands of follicles, each of which contains one egg. Follicles are essentially nonfunctional before puberty. During puberty, under the action of gonadotropins from the anterior pituitary gland, immature follicles gradually develop and simultaneously synthesize estrogen. When the follicle matures and ovulates, the egg wall collapses and the cells become larger and yellower, called the corpus luteum, which not only synthesizes estrogen but also produces progesterone. As the ovaries change, the endometrium is affected by them and undergoes corresponding cyclic changes. Estrogen causes the endometrium to thicken, endometrial cells increase and enlarge, and the tubes become more tortuous and spiral-shaped, which is called the proliferative endometrium. Common knowledge about menstruation: After ovulation, due to the combined action of estrogen and progesterone, the endometrium becomes edematous, the glands produce a large amount of mucus and glycogen, and the thickness of the endometrium increases from one millimeter to six millimeters, which is called the secretory phase endometrium. If the egg discharged at this time is fertilized, the fertilized egg will be transported to the uterus through the fallopian tube to develop, which is called pregnancy. The pregnancy tissue synthesizes a chorionic gonadotropin, which supports the continued development of the corpus luteum of the ovary. ； If the egg is not fertilized, the corpus luteum atrophies and stops secreting estrogen and progesterone about 14 days after ovulation. At this time, the blood vessels in the endometrium contract and the endometrium becomes necrotic and falls off, causing bleeding and menstruation. Therefore, the length of the menstrual cycle depends on the length of the ovarian cycle, which is generally thirty days, but varies from person to person, and can also be forty-five days, or even three months or half a year. As long as it is regular, it is generally considered normal menstruation. The bleeding time is generally seven days, and the total amount of bleeding during each menstrual period is 50 ml. Some people think that more than 80 ml of menstrual bleeding is a pathological condition.

　　Have you understood the common sense about menstruation? Why do girls have menstruation but boys don’t? It’s because the reproductive organs of men and women are different, so naturally they are a little different.