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 and men have a combination of these hormones with women having more estrogen and progesterone and men having more testosterone. The right balance of each hormone is needed to regulate certain sexual and reproductive functions and prevent related health issues. Estrogen - In women, this hormone is responsible for the development and function of breasts, edemetrium (inner layer of uterus), and the menstrual cycle.