Mature Graffian follicle is generally present in the ovary of a healthy human female around.

Options

A. 5-8 day of menstrual cycle
B. 11-17 day of menstrual cycle
C. 18-23 day of menstrual cycle
D. 24-28 day of menstrual cycle

Answer

B

Explanation

In humans (female), the menstrual cycle laste for about 28/29 days. It is the follicular phase in which the primary follicles in the ovary grow to become a fully mature graafian follicle (due to FSH stimulation). This phase (follicular) laste for about 14 days.
The secretion of gonadotropins (LH and FSH) increases gradually during this phase and stimulates secretion of estrogen by the growing follcles both LH and FSH attain a peak level in the middle of cycle (about 14th day).
This rapid secretion of LH and LH surge, induces rupture of Graafian foillcle and thereby the release of ovum. This ovulatory phase is following by the luteal phase during which the remining follicular cells enlarge to become the corpus luteum.