Menstrual flow occurs due to lack of
oxytocin
vasopressin
progesterone
$FSH$
Changes in $GnRH$ pulse frequency in femail is controlled by circulating levels of
Ripe ova are shed by ovaries into
The menstrual cycle in normal adult woman is of
During menstruation the level of progesterone in blood is
If after ovulation no pregnancy results, the corpus luteum