menstruation+Ed+and+Sk

Menstruation: Menstruation is the shedding of the uterine lining (the endometrium). It occurs on a regular basis (around 28 days) in reproductive age females. By menstruating you are releasing that months egg that has not been fertilised by a sperm cell. Although, if the egg for the month (28 days) has been fertilised by a sperm cell there is no menstruation and the egg in the uterus grows into a baby. Many girls have their first period about a year after they start having some of the other changes of puberty. This is commonly between the ages of 12- 15.

Home Picture from www.thehealthage.com/.../ 03/mensturation.jpg