The graph given below is representing the reproductive cycle in female

1.	The graph given below is representing the reproductive cycle in females. Analyse the graph in regard of a normal menstrual cycle and answer the questions given below.(1) Identify the hormones marked as ‘X’ and ‘Y’(2) Explain the ovarian phases during menstrual cycle.(a) 5th day to 12th day of the cycle.(b) 14th day of the cycle.(c) 16th day to 25th day of the cycle.(3) What influence does hormones ‘X’
Answer» (1)Hormone ‘X’ is Luteinising Hormone (LH). Hormone ‘Y’ is Follicle Stimulating Hormone (FSH). (2) (a) Follicular phase (proliferative phase) (b) Ovulatory phase (release of ovum). (c) Luteal phase (3) (a) FSH is secreted by the anterior pituitary, which stimulates the ovarian follicle to secrete oestrogen, which in turn stimulates the proliferation of the endometrium of the uterine wall. (b) Both LH and FSH attain a peak level in the middle of cycle (about 14h day). Rapid secretion of LH leading to its maximum level during the mid-cycle is called LH surge which induces the rupture of Graafian follicle’and thereby the release of an ovum (ovulation). (c) The remaining cells of ovarian follicles are further stimulated by the LH to develop corpus luteum which secretes large amount of progesterone, a hormone essential for the maintenance of an endometrium.

The graph given below is representing the reproductive cycle in females. Analyse the graph in regard of a normal menstrual cycle and answer the questions given below.(1) Identify the hormones marked as ‘X’ and ‘Y’(2) Explain the ovarian phases during menstrual cycle.(a) 5th day to 12th day of the cycle.(b) 14th day of the cycle.(c) 16th day to 25th day of the cycle.(3) What influence does hormones ‘X’

Answer»

(1)Hormone ‘X’ is Luteinising Hormone (LH).
Hormone ‘Y’ is Follicle Stimulating Hormone (FSH).

(2) (a) Follicular phase (proliferative phase)
(b) Ovulatory phase (release of ovum).
(c) Luteal phase

(3) (a) FSH is secreted by the anterior pituitary, which stimulates the ovarian follicle to secrete oestrogen, which in turn stimulates the proliferation of the endometrium of the uterine wall.
(b) Both LH and FSH attain a peak level in the middle of cycle (about 14h day). Rapid secretion of LH leading to its maximum level during the mid-cycle is called LH surge which induces the rupture of Graafian follicle’and thereby the release of an ovum (ovulation).
(c) The remaining cells of ovarian follicles are further stimulated by the LH to develop corpus luteum which secretes large amount of progesterone, a hormone essential for the maintenance of an endometrium.

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