Question

what is menstrual cycle ? which hormones regulate menstrual cycle ?

Answer 1

Hi...

Menstrual cycle refers to the cycle of certain physiological changes in fertile females possessing placenta. Various hormones are involved in controlling the cycle.


The menstrual cycle is regulated by Luteinizing ............


The role of hormones is as follows:

1) Pituitary gland secretes Follicle Stimulating Hormone (FSH) which stimulates the development of follicle.

2) The follicle cells then secretes estrogen. Increase in the level of estrogen, stimulates the thickening of endometrium in the uterus. Also, it leads to the secretion of Luteinizing hormone (LH) by the pituitary gland which causes ovulation.

3) The level of LH increase and this is followed by increase in the secretion of progesterone and the follicle develops to for corpus luteum.


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Answer 2

Answer:

• It is a cycle observed to be taking place in females, lasting for around 28 days on an average to complete

• It is a series of cyclic physiological changes occurring the female reproductive tract in primates, the end of which is combined with the collapsing of the uterine endothelium that is liberated in the form of blood and mucos through the vaginal opening, which is termed as menses.

• The different hormones that regulate the menstrual cycle are LH – leutinizing hormone, FSH – follicle stimulating hormone, progesterone, estrogen.

• During the follicular phase, the levels of LH and FSH that is secreted from the anterior pituitary gland increases. The FSH that is secreted under the effect of the releasing hormone (RH) from the hypothalamus, triggers the primary follicle to convert into a Gaarfian follicle.

• There is a gradual increase in the level of LH which causes the follicle to grow, also causing the secretion of estrogen.

• Estrogen obstructs the FSH secretion, triggering the secretion of the LH, which also results in the thickening of the uterine endometrium.

• The amplified secretion of LH also results in the Graffian follicle to rupture, thereby causing the release of the ovum into the fallopian tube.

• This ruptured graafian follicle transforms into corpus luteum which secretes the hormone – progesterone during the luteal phase.

• When the progesterone level in the blood is high, the FSH and LH secretion decreases which furthermore hinders the process of ovulation.