What Is Menstruation? What Are Periods?

A period, or menstruation, is the shedding of the endometrium - the uterine lining. Menstruation is also known as menses. All female humans, as well as some other female mammals, have regular periods during their reproductive age. Menstruation which includes bleeding from the vagina is found mainly among humans and similar animals, such as primates. In many mammals, the endometrium is reabsorbed by the animal.

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Filed under: Endocrinology on June 21st, 2009