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 is produced by the pituitary gland. 1  In women, FSH helps control the menstrual cycle and the production of eggs by the ovaries. 2  The amount of FSH varies throughout a woman's menstrual cycle and is highest just before she releases an egg (ovulates). 3  In men, FSH helps control the production of sperm.