Question

What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.

Answer 1

Hormonal control of menstrual cycle:

GnRH (gonadotropin releasing hormone) from the hypothalamus stimulates the anterior pituitary to release gonadotropins called FSH and LH. They act on the ovaries.




Role of gonadotropins in follicular phase of menstrual cycle:

Role of gonadotropins in the follicular phase of menstrual cycle are as follows: Role of FSH (follicle stimulating hormone)

• The follicles in the ovary undergoes development from primary follicle up to graafian follicles under the influence of FSH.
• FSH reaches its peak in the mid cycle.
• FSH stimulates the ovarian follicles to secrete oestrogen.

Role of gonadotropins in the ovulatory phase of menstrual cycle:

Role of LH (Luteinizing hormone)

• LH attains its peak in the mid cycle called LH surge.
• It induces the rupture of the Graffian follicle and thereby release of secondary oocytes.