(a) Draw a diagrammatic sectional view of the female reproductive system of human and label the parts
(i) where the secondary oocytes develop
(ii) which helps in collection of ovum after ovulation
(iii) where fertilization occurs
(iv) where implantation of embryo occurs.
(b) Explain the role of pituitary and the ovarian hormones in menstrual cycle in human females.

Explanation

(b) Role of pituitary hormones in menstrual cycle. The secretion of gonadotropins (LH and FSH) stimulates follicular development as well as secretion of estrogens by the growing ovarian follicles. Both LH and FSH attain a peak level in the middle of the cycle (about 14 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 is followed by the luteal phase during which the remaining parts of Graafian follicle transform as the corpus luteum. LH maintains the corpus luteum as well as secretion of progesterone by the corpus luteum.