Question

Choose the correct answers from the alternative given. During the postovulatory phase,
the hormone that is most dominant is
A) Progesterone
B) Estrogens
C) Luteinizing hormone (LH)
D) Follicle-stimulating hormone (FSH)

Answer 1

In a female with a 28 days menstrual cycle, ovulation occurs after the 14days of
menstruation. During ovulation, the follicle swells up and bursts to release the ovum. The ovum is active or can survive for around 36 hours after ovulation and the phase after ovulation is called the post-ovulatory stage.

Complete answer: LH or Luteinizing Hormone is necessary for the final follicular growth and in ovulation. The levels of LH start rising before the two days of ovulation and increase several folds during ovulation. This is called the LH surge. LH allows the granulosa and theca cells to form
progesterone. During this time, the secretion of LH is increased several fold from the pituitary gland and thus, LH surge is a phenomenon associated with ovulation. The concentration of estradiol decreases after ovulation and before menstruation. The estradiol levels start rising before ovulation and immediately start to decline after ovulation. Thus, a decrease in estradiol is not associated with ovulation. The secondary oocyte or the ovum is released by the ovaries during ovulation. The high levels of LH and FSH synergistically allow the follicles to swell before 2days of ovulation and they burst to release an ovum. During the ovulation stage itself, the granulosa cells and theca cells start secreting progesterone and it is at the highest peak post ovulation as it helps develop a corpus luteum.
Hence, the correct answer is option (A).

Note: The phase before ovulation is called the follicular phase and in the ovulatory phase the follicle ruptures to release the secondary oocyte, and then the phase post ovulation is called the luteal
phase where it forms corpus luteum.