Following the ovulation of an egg from the ovary, the follicle which surrounded that egg is not finished with its work.
Now it becomes the corpus luteum, a group of cells, capillaries and connective tissue with a life span of about 14 days.
During those 14 days, the corpus luteum triggers the production of the hormone progesterone, stimulating the endometrium (lining of the uterus) to prepare for a blastocyst to implant.
If the blastocyst does not implant, progesterone levels drop and menstruation occurs.
Moon photo Courtesy NASA/JPL-Caltech
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