Each month during a woman’s menstrual cycle, the endometrium grows and thickens to prepare for implantation of a fertilized ovum. When the endometrium reaches its full thickness, an egg is released from the ovaries. If the egg is fertilized, it attaches to the thickened endometrium. However, if the egg is not fertilized, the endometrial layer is sloughed off as a normal part of the menstrual cycle.
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