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 28thday?
(a) A is the hormone estrogen. B is the hormone progesterone.
(b) Estrogen is produced by the Graafian follicle and Progesterone is produced by corpus luteum.
(c) Graafian follicle forms before that releases estrogen whereas, corpus luteum develops later that forms progesterone.
(d) A (estrogen) regenerates endometrium lining of the uterus whereas, B (progesterone) maintains the endometrium for implantation of the fertilized ovum and maintains pregnancy.
(e) In case of pregnancy B (progesterone) remains high.