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.
How Hormones Control Your Cycle. First things first: All women have different menstrual cycles. Whether youâre waiting for your first period or have been getting them for a while, just know that your cycle is most likely on a different schedule than your friendsâ or momâs.In your cycle, âday oneâ is the first day of your period, or the first day you begin to bleed.our cycle starts over at the beginning of your next period. This may come as a surprise, but your âmonthlyâ menstrual cycle doesnât always take place once a month. Although the average menstrual cycle is 28 days, your cycle could be anywhere from 21 to 35 days.