Here are some quick tips on how to distinguish classic crystal from plain glass. 1  Hold up a glass to the light. 2  If the glass acts as a prism and you see a rainbow you are holding crystal. 3  If not, it is just plain glass. 4  When struck, crystal produces a musical ring. 5  Glass does not.
Hormonal control of menstrual cycle. The ovarian hormones circulate in the blood and are excreted in modified forms in the urine. Estimation of the urinary output by chemical methods gives an indication of the blood levels and of the total production of these substances.
Women's Reproductive Health. Hormones are key to reproductive health in all aspects of a womanâs sexual life. They regulate menstruation, fertility, menopause, and sex drive (libido). The main hormones affecting the menstrual cycle and fertility are produced by glands in the brain and by the ovaries. part of the brain called the hypothalamus produces GnRH (gonadotropin-releasing hormone). GnRH is a hormone that triggers the pituitaryâa pea-sized gland just below the hypothalamusâto release two other hormones: follicle stimulating hormone (FSH) and luteinizing hormone (LH).