EDU 5661 Lecture Notes - Lecture 2: Ovulation, Menarche, Tampon
30 Oct 2020
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Document Summary
Menstruation is the shedding of the lining of the uterus (endometrium) accompanied by bleeding. It occurs in approximately monthly cycles throughout a woman"s reproductive life, except during pregnancy. Menstruation starts during puberty (at menarche) and stops permanently at menopause. By definition, the menstrual cycle begins with the first day of bleeding, which is counted as day 1. The cycle ends just before the next menstrual period. Menstrual cycles normally range from about 25 to 36 days. Only 10 to 15% of women have cycles that are exactly 28 days. Usually, the cycles vary the most and the intervals between periods are longest in the years immediately after menarche and before menopause. Menstrual bleeding lasts 3 to 7 days, averaging 5 days. Blood loss during a cycle usually ranges from to 2 ounces. A sanitary pad or tampon, depending on the type, can hold up to an ounce of blood.
