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Expanded definition.
'''Menstruation''' occurs at the end of a [[placenta]]l [[mammal]]'s menstrual cycle. There are two types of menstruation:
'''Menstruation''' or menses occurs at the end of a [[placenta]]l [[mammal]]'s menstrual cycle. There are two types of menstruation:
* Overt menstruation, occuring in [[human]]s and [[great apes]], in which the lining of the [[uterus]] is shed and expelled from the body to prepare the uterus for a fertilized [[ovum]]<ref>[http://www.4woman.gov/faq/menstru.htm#4 Menstruation and the Menstrual Cycle, from the US Dept. of Health and Human Services]</ref>;
* Overt menstruation, occuring in [[human]]s and [[great apes]], in which the lining of the [[uterus]] is shed and expelled from the body;
* Covert menstruation, occuring in all other placental mammals, in which the [[endometrium]] is reabsorbed.
* Covert menstruation, occuring in all other placental mammals, in which the [[endometrium]] is reabsorbed.
Over the course of the menstrual cycle, the lining of the uterus builds up in preparation for implantation of a fertilized [[ovum]]. If no conception occurs, the thickened lining is sloughed off and flows out though the cervix and vaginal canal. The process of thickening then starts again for the next menstrual cycle.<ref>[http://www.4woman.gov/faq/menstru.htm#4 Menstruation and the Menstrual Cycle, from the US Dept. of Health and Human Services]</ref> If conception occurs, hormonal changes occur in the body that prevent menstruation from occurring.
Menarche is the onset of menstruation in an adolescent. This average age of menarche is twelve, but there is much variation. Amenorrhea is an unusual absence of menstruation and should be cause for medical consultation.
==Menstruation and the Bible==
==Menstruation and the Bible==