During menstruation the level of progesterone in blood is
Low
High
Normal
Very high
Menstrual flow occurs due to lack of
About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?
Lack of menstruation is caused due to
The structure formed after release of ova from graafian follicles and secretory in nature, is
Which of the following is false for progesterone ?