The following is the illustration of the sequence of ovarian events (a-i) in a human female.

(a) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(b) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned events.
(c) Explain the changes that occurs in the uterus simultaneously in anticipation.
(d) Write the difference between C and H.

Explanation

(a) A- Primordial follicle, B- Primary follicle, C- Secondary follicle, D-Tertiary follicle, E- Mature graafian follicle, F- Ovulation (release of egg), G- Empty Graafian follicle, H-Corpus luteum, I - Corpus albicans.
(b) Pituitary hormones: Follicle Stimulating Hormones (FSH) and Lutenizing Hormone (LH). Ovarian hormones: Estrogen and Progesterone.
(c) At the start of menstrual cycle, the endometrium of uterus starts regenerating through proliferation of cells induced by FSH and CH. After ovulation, the progesterone secreted by corpus luteum prepares the endometrium (uterine wall) to receive the egg if it is fertilized.
(d) C- Secondary follicle
H - Corpus luteum During development of ovum, the primary follicle gets surrounded by many layers of granular cells and forms a new layer called secondary follicle.
Corpus luteum is the empty graafian follicle that remains after ovulation. It acts as a transitory endocrine gland secreting progesterone to maintain pregnancy.