Menstruation cycle occurs
In all mammals
In eutherian animals
In metatherian animals
In all primates
The placenta helps in the maintenance of pregnancy by secreting a hormone, known as
Ovulation does not occur during pregnancy in the human female because
In girl, the first menstruation begins at puberty and is called .....
About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?
What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle ? Explain the shifts in steroidal secretions.