Question

If there is no fertilization then corpus luteum start degeneration on $9^{th}$ day of its formation. Reason of start of degeneration is?

• A. Increase in amount of LH
• B. Decrease in amount of LH
• C. Increase in amount of GnRH
• D. Decrease in level of progesterone

Answer 1

The correct option is B Decrease in amount of LH

If the egg is not fertilized, the corpus luteum stops secreting progesterone and decays (after approximately 10 days in humans). It then degenerates into a corpus albicans, which is a mass of fibrous scar tissue.

The uterine lining (endometrium) is expelled through the vagina (in mammals that go through a menstrual cycle ). In an estrous cycle, the lining degenerates back to normal size accompanied by a decreased amount of LH.

So the correct answer is 'Decrease in amount of LH'.