Menstruation is a woman’s monthly normal vaginal bleeding often called the period. When a baby girl is born, her ovaries contain hundreds of of eggs, which stay inactive until puberty begins There isn't one right age for a girl to get her period but Most girls get their first period about 2 years after their breasts start to develop. when they're between age 10 and 15 but it's different, every girl's body has its own schedule two structures in the brain, the pituitary gland and the hypothalamus produce complex hormones that stimulate the ovaries to make female sex hormones start and control The menstrual cycle.
and it will continue to about age 51 usually lasting from three to 8 days The menstrual cycle includes several phases The first phase of the menstrual cycle begins on the first day of bleeding and lasts for about 14 days The pituitary gland (located at the base of the brain releases a hormone called FSH. This hormone causes one fluid-filled “follicles contain a mature egg to develop. The maturing follicle produces the hormone called estrogen.
which increases over and peaks in about day 12 and causes The lining of the uterus (endometrium) to to become thicker and more enriched with blood vessels. in fact the women's body prepares to get pregnant On about day 14, the high amount of LH and FSH cause he egg to be released from the follicle, the high level of LH also causes a brief surge in testosterone, which increases sex drive, right at the most fertile time of the cycle After release, the egg enters the fallopian tube tiny hairs in the tube's lining help push it down the narrow passageway toward the uterus if the sperm cell can successfully meet an egg cell in the fallopian tube, the fertilization will take place here Once the egg is released, the follicle seals over and this is called the corpus luteum After the release of the egg, levels of FSH and LH decrease The corpus luteum produces progesterone If fertilization has occurred, the corpus luteum continues to produce progesterone which prevents the endometrial lining from being shed If the egg is not fertilized, it disintegrates after about 24 hours then the corpus luteum also disintegrates which causes progesterone levels to drop and signals the endometrial lining to begin shedding after about 14 days The menstrual blood is partly blood and partly tissue from inside the uterus.
