Question

Briefly describe the events that occur during the luteal phase of menstrual cycle.

Answer 1

1. The luteal phase lasts from the 15^th to 28^th day of the menstrual cycle.
2. After ovulation, the ruptured Graafian follicle transforms into the corpus luteum under the influence of LH.
3. The corpus luteum secretes a large amount of progesterone necessary for maintaining the thick, vascularized endometrium.
4. The uterine glands secrete mucus (uterine milk) to nourish a potential embryo.
5. If fertilization occurs, the corpus luteum functions throughout pregnancy.
6. In the absence of fertilization, the corpus luteum degenerates into corpus albicans, progesterone levels drop.
7. The endometrium breaks down leading to menstruation, marking the beginning of a new cycle.