The menstrual cycle occurs monthly in women when pregnancy fails to occur after an egg is produced.
Menstruation refers to the monthly bleeding that occurs in a woman when pregnancy fails to occur after the release of a mature egg into the ovary. The sequence of menstruation is shown below;
- The endometrium or lining of the uterus becomes thicker in preparation for the implantation of the fertilized egg.
- A new egg cell starts to mature within the ovary.
- An egg in the ovary continues to mature.
- The mature egg moves to the surface of the ovary just before mid- cycle.
- The mature egg is released.
- The mature egg travels from the ovary to the uterus.
- The process of fertilization may take place.
- Uterine linings begin to break down and bleeding results.
- The lining of the uterus becomes thin after bleeding.
- The next menstrual-cycle is then about to begins.
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