Arrange the following events in the female reproductive cycle in their natural sequence.
A. Ovulation
B. Growth of corpus luteum
C. Sudden increase in level of LH
D. Secretion of FSH
E. Growth of ovarian follicle and oogenesis
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → D-E-C-A-B
D. Secretion of FSH — first. In the follicular phase the pituitary releases FSH (and LH), which start the growth of the follicles.
E. Growth of ovarian follicle and oogenesis — second. Under FSH the primary follicles grow into a Graafian follicle, and the oocyte inside matures.
C. Sudden increase in level of LH — third. In the middle of the cycle (about day 14) LH reaches its peak: the LH surge.
A. Ovulation — fourth. The LH surge makes the Graafian follicle rupture and release the ovum.
B. Growth of corpus luteum — last. In the luteal phase the remains of the Graafian follicle become the corpus luteum, which secretes progesterone.
NCERT Extract:
Menstrual Cycle – “… The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of cycle (about 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle called LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum (Figure 2.9).”
