Question

The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle :

(a) Identify A and 'B'.

(b) Specify the source of the hormone marked in the diagram.

(c) Reason : out why A peaks before B.

(d) Compare the role of A and B.

(e) Under which condition will the level of B continue to remain high on the 28th day ?

Answer 1

(a) (A) Estrogen

(B) Progesterone

(b) (A) Maturing ovarian folliclezGraafiarr follicle

(B) Corpus luteum

(c) Formation of Graafian follicle (releases estrogen) is followed by the formation of corpus luteum (releases progesterone)

(d) Role of A (Estrogen)- Leads to changes in the ovary and **/regeneration of endometrium through proliferation.

Role of B (Progesterone)- Maintenance of endometrium for implantation of the fertilized ovum/maintenance of other events of pregnancy.

(e) ln case of pregnancy.