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.
FSH. Follicle-stimulating hormone (FSH) helps control a womanâs menstrual cycle and the production of eggs. In men, it regulates the production and transportation of sperm. For women, a FSH test is done on the third day of the menstrual cycle and is used to evaluate egg supply.