The monthly ovarian cycle can be divided into follicular and luteal phases. During the follicular stage, FSH from the anterior pituitary stimulates the development of an ovarian folLiCle, which produces estrogen and a small amount of progesterone. High levels of estrogen in the blood exert negative feedback control over the anterior pituitary to stop the release of FSH and to halt the follicular phase of the ovarian cycle. What are the two phases of the monthly ovarian cycle?
1) Follicular and luteal
2) Follicular and menstrual
3) Luteal and menstrual
4) Menstrual and ovulation