Question

Hypothalamus secretes GnRH Ovaries release estrogen Corpus luteum forms Progesterone inhibits LH secretion Corpus luteum atrophies, stops secreting progesterone Decreased LH and FSH levels LH makes corpus luteum secrete progesterone High estrogen levels inhibit FSH secretion, stimulate LH production Anterior pituitary secretes LH and FSH LH makes mature follicle burst: Ovulation Decreased estrogen and progesterone levels stimulate GnRH secretion Graafian follicle stimulated Arrange steps in order

Answer 1

the menstrual cycle has 4 phases, that are:

• menstrual phase
• follicular phase
• ovulatory phase
• luteal phase

in menstrual phase, when egg not get fertilized (previous) it sheds with blood, tissues and mucus through the vagina.

in the follicular phase, the hypothalamus secretes Gonadotrophin-releasing hormone(GnRH), this stimulates anterior pituitary, to secrete Luteinising hormone(LH) and Follicular Stimulating Hormone(FSH) makes the mature follicle burst. Ovaries comes out and release estrogen, high estrogen level inhibits FSH secretion and these reduce LH and FSH levels.

ovulatory phase

After the release of ovary,graffian follicle converted to form corpus luteum; stimulates LH production.

Luteal phase

LH makes corpus luteum to secrete progesterone.If pregnancy occurs, progesterone inhibits LH secretion. In the absence of pregnancy, corpus luteum atrophies and stops secreting progesterone.

And again menstrual phase occurs and at this time estrogen and progesterone levels are low.