Why do girls menstruate and why do girls menstruate

The uterus can give birth to a baby after it is enlarged.

Menstrual irregularities are characterized by abnormal bleeding during the menstrual cycle, abdominal pain and systemic symptoms before and during menstruation. **May be organic or dysfunctional. Blood diseases, hypertension, liver diseases, endocrine diseases, miscarriages, ectopic pregnancies, molar pregnancy, genital tract infections, tumors, etc. can cause menstrual disorders.

Are you a woman? You can give birth to a little pot friend!

When a girl reaches puberty, periodic bleeding occurs in the uterus every 28 days or so, which is menstruation. After a normal woman menstruates from puberty, she has a regular menstrual cycle until menopause, except for pregnancy and lactation.

The endometrium is divided into two layers, the surface layer is called the functional layer, and the changes in the menstrual cycle are mainly carried out in this layer, and this layer has to go through a shedding and re-repair every menstrual cycle; The layer close to the muscles is called the basal layer, and after the functional layer is shed during the menstrual cycle, a new functional layer is produced from this layer. The endometrium undergoes a financial change with ovulation of the ovaries. After a girl is born, there are many primordial follicles in the ovaries.

After entering puberty, one follicle generally matures every month. The eggs in the mature follicle are released from the ovaries into the abdominal cavity, which is called ovulation. The day of ovulation is roughly in the middle of the next menstrual period, that is, about 14 days before the next menstrual period.

Before ovulation, the ovaries produce estrogen during follicle development, and the endometrium is affected by estrogen and gradually thickens up to about 2 mm.

At this time, the glands of the endometrium grow, the arteries become thicker and bend, and the connective tissue proliferates. After the follicle ruptures and releases the egg, it shrinks and forms the corpus luteum. In addition to estrogen, the corpus luteum also secretes progesterone.

Under the action of estrogen and progesterone, the endometrium continues to thicken to about 5 mm. At this time, the endometrial glands grow further, the secretions of glandular cells increase, the arteries become more dilated and congested, and the fluid in the connective tissue increases. Physiological phenomena.

The body structure of men and women is different! So girls will have this! If you go deeper, you can't understand the answer!

Why do girls have periods? Because you are a girl, the gender of a girl is different from that of a boy, the sex hormones are not the same as that of a boy, and the reproductive system is not the same, and their gender determines that they will have menstruation, ovulation, and have children.

Normal physiology.