Question

During bleeding phase of menstrual cycle
unfertilized secondary oocyte undergoes
autolysis. The interplay of hormones then is

• A. progesterone and estrogen continue the hypertrophy of endometrial lining
• B. prolactin and progesterone reduces LH level causing regression of corpus luteum
• C. progesterone inhibits the release of LH from pituitary causing regression of corpus luteum
• D. prolactin and estrogen inhibits progesterone secretion leading to sloughing off of uterine lining

Answer 1

The correct option is C progesterone inhibits the release of LH from pituitary causing regression of corpus luteum

If there is no fertilisation then the endometrium along with the unfertlised is shedded. This results in the bleeding phase of menstrual cycle. After the release of the secondary oocyte, the remaining cells of the graffian follicle forms the corpus luteum. The corpus luteum secretes progesterone hormone. This inhibits the secretion of LH by the pitutary gland. As a result of which the corpus luteum degenerates.