Question

Which one of the following is the correct matching of events occurring during the menstrual cycle?

• A. Secretory phase – Development of corpus luteum and increased secretion of progesterone
• B. Proliferative phase – Rapid regeneration of myometrium and maturation of Graafian follicle
• C. Ovulation – LH, and FSH attain peak levels and a sharp fall in the secretion of progesterone
• D. Menstruation – Breakdown of myometrium and ovum not fertilized

Answer 1

The correct option is A

Secretory phase – Development of corpus luteum and increased secretion of progesterone

The correct option is A.

Explanation of the correct answer:

1. The secretory phase is the last phase of the menstrual cycle.
2. Due to secretion of Luteinising hormone (LH) from the pituitary, it is also known luteal phase.
3. LH leads to the development of the Corpus Luteum which secrets progesterone and leads to an increased level of progesterone.

Explanation of the incorrect answers:

Option B:

1. In the Proliferative phase, due to the secretion of Follicle-stimulating hormone (FSH) from the pituitary gland, the Ovarian follicle starts to secret estrogen.
2. Due to the coiling of long blood vessels, the endometrial wall becomes thick.

Option C:

1. In the Ovulation phase, Luteinising hormone and Follicle-stimulating hormone do attain peak levels suddenly but this does not lead to a reduction in progesterone level.
2. Rather it leads to rupturing griffin follicle to release an ovum.

Option D:

1. The menstruation or Bleeding phase lasts for 3-5 days.
2. In the menstruation phase, the Secretion of LH decreases, leading to decreased levels of estrogen and progesterone.
3. Also, the endometrial wall breaks down when fertilization doesn't occur.

Final answer:

Secretory phase – Development of corpus luteum and increased secretion of progesterone is the correct matching of events occurring during the menstrual cycle