Menstruation is vaginal bleeding that occurs each month in women. It is also called menses, menstrual period, or period. When a woman has her period, she is menstruating. Menstrual blood is made of both blood and tissue that sheds each month from the lining of the uterus (womb). It flows from the uterus through the small opening in the cervix, and passes out of the body through the vagina. Most menstrual periods last from three to five days.
What is the menstrual cycle?
Menstruation is part of the menstrual cycle and helps the body prepare for the possibility of pregnancy each month. The first day of the menstrual cycle is the first day that bleeding occurs. The average menstrual cycle is 28 days long. However, a cycle can range anywhere from 23 days to 35 days.
The parts of the body involved in the menstrual cycle include the brain, pituitary gland, uterus and cervix, ovaries, fallopian tubes, and vagina. Body chemicals called hormones rise and fall during the month and make the menstrual cycle happen. The ovaries make two important female hormones, estrogen and progesterone. Other hormones involved in the menstrual cycle include follicle-stimulating hormone allso called FSH and luteinizing hormone or LH, made by the pituitary gland.
What happens during the menstrual cycle?
In the first half of the menstrual cycle, levels of estrogen rise and make the lining of the uterus grow and thicken. In response to follicle-stimulating hormone, an egg (ovum) in one of the ovaries starts to mature. At about day 14 of a typical 28-day cycle, in response to a surge of luteinizing hormone, the egg leaves the ovary. This is called ovulation.
In the second half of the menstrual cycle, the egg begins to travel through the fallopian tube to the uterus. Progesterone levels rise and help prepare the uterine lining for pregnancy. If the egg becomes fertilized by a sperm cell and attaches itself to the uterine wall, the woman becomes pregnant. If the egg is not fertilized, it either dissolves or is absorbed into the body. If pregnancy does not occur, estrogen and progesterone levels drop, and the thickened lining of the uterus is shed during the menstrual period.
Next page: What is a Typical Menstrual Period Like?
