Answer:
1. The hypothalamus monitors and causes the release of hormones from the pituitary gland.
2. The hypothalamus sends a gonadotropin-releasing hormone (GnRH) to the anterior pituitary.
3. Gonadotropin releasing hormone (GnRH) from the hypothalamus stimulates luteinizing hormone (LH) and follicular stimulating hormone (FSH) release from the anterior pituitary gland.
4. LH and FSH are gonadotropins that act primarily on the ovaries in the female reproductive tract.
5. The FSH assists in the maturation of the follicles and causes the secretion of estrogen from the follicles.
6. The LH initiates the maturation of the follicles, converts ruptured follicles into corpus luteum and causes the secretion of progesterone
7. If fertilization occurs, the developing embryo will implant in the endometrium and the ovary itself release a hormone estrogen which causes the uterine lining to increase in thickness.
8. If fertilization doesn't occur, the corpus luteum eventually degenerates, the estrogen and progesterone levels drop, and the endometrium can no longer be maintained.
9. The thick uterine lining is no longer necessary, so the cells of the thickened uterine lining break off and leave thru the vagina. The unfertilized egg is lost and some blood is lost too. This loss of cells from the uterus lining, blood and egg is called menstruation.
10. After menstruation, the cycle starts again.
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