The menstrual cycle B1a 1.3

Hormones control the functions of many of your body organs. They also control the activities of your individual cells. A woman's menstrual cycle is a good example. 

The average time of the menstrual cycle (MC) lasts 28 days. Each month the lining of the womb thickens ready for a baby to develop there. At the same time, an egg starts maturing in the ovary.

About 14 days after the egg starts maturing it is released from the ovary ready for fertilization. This is known as ovulation. The lining of the womb stays thick for several days after the egg has been released. 

If the egg is fertilized then pregnancy takes place, the lining of the womb provides protection and food for the developing embryo. If the egg…