Question

Which of the following events is not associated with ovulation in human females?
A.LH surge
B.Decrease in estradiol
C.Release of secondary oocytes
D.Both B and C

Answer 1

In a female with a 28 days menstrual cycle, ovulation occurs after the 14days of menstruation. During ovulation, the follicle ruptures, and the ovum is released. The ovum is active or can survive for around 36 hours after ovulation.

Complete step by step answer:
Option A) LH or Luteinizing Hormone is necessary for the final follicular growth and in ovulation. The levels of LH start rising before the 2 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 LSH is increased several folds from the pituitary gland and thus, LH surge is a phenomenon associated with ovulation
Option B) The concentration of estradiol decreases after ovulation and before the menstruation. The estradiol levels start rising before the ovulation and immediately start to decline after ovulation. Thus, a decrease in estradiol is not associated with ovulation.
Option C) 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. Release of proteolytic enzymes from the lysosome of the theca externa, causes the dissolution of the follicular capsular wall and consequent weakening of the wall, resulting in further swelling of the entire follicle and degeneration of the stigma. This causes the follicular rupture and discharge of the ovum.
Option D) Release of secondary oocytes is associated with ovulation and a decrease in estradiol is not, so option D can be neglected.

Hence, the correct answer is an option (B).

Note:
There is an increase in the level of Luteinizing and follicular luteinizing hormone during ovulation. There is an increase in the level of progesterone and a decrease in estradiol after ovulation.