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.
Estrogen is needed for the normal development of the breasts and uterus. This sex hormone also controls ovulation (the period when women are most fertile) and is closely tied to many other aspects of a woman's health, including keeping bones strong and protecting against heart disease.Progesterone controls a woman's menstrual cycle.his sex hormone also controls ovulation (the period when women are most fertile) and is closely tied to many other aspects of a woman's health, including keeping bones strong and protecting against heart disease.