Shortly after the beginning of puberty in girls, and usually after the development of breasts, menstruation starts. While menstruation usually begins between ages 12 and 13, it may happen at a younger or older age. The first menstrual period is called menarche
The menstrual cycle is about four weeks long, starting on the first day of bleeding and ending when the next period begins.
The menstrual discharge comes from the uterus through the vagina. The uterus is a hollow, pear-shaped organ, responsible for maintaining and nourishing the embryo and fetus during a pregnancy. The vagina, or "birth canal," provides a path for menstrual fluids to leave the body.
During a period, there are usually 2-3 days of relatively heavy bleeding followed by 2-4 days of lighter flow. The fluid during a menstrual period is a mixture of uterine lining tissue and blood.
The total monthly blood loss varies from 1/2 ounce to 10 ounces (averaging 4 to 5 ounces). To give you an idea of how much this is, a sanitary pad or tampon holds about one ounce of fluid. Most teens report changing pads about three to six times a day, although this varies depending on school rules and the amount of time allowed between classes.
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Read the Original Article: All About Menstruation