Which one of the following statements is correct in explaining the feedback control mechanisms regulating the reproductive cycles in human female?

Whereas a slow rise of estrogen inhibits the secretion of FSH and LH, high concentration of estrogen have the opposite effect and stimulates the secretion of FSH and LH from the anterior pituitary.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Whereas high concentration of estrogen inhibits the secretion of pituitary gonadotropins, low concentration of estrogen have the opposite effect and stimulates the secretion of gonadotropins by acting on the hypothalamus to increase its output of GnRH.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Whereas low concentration of GnRH stimulates the release of LH and FSH, high concentration of GnRH have the opposite effect and inhibits the secretion of LH and FSH.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Whereas the lower concentration of prolactin inhibits the secretion of estrogen, higher concentration of prolactin have opposite effect and stimulates the release of estrogen.

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Whereas a slow rise of estrogen inhibits the secretion of FSH and LH, high concentration of estrogen have the opposite effect and stimulates the secretion of FSH and LH from the anterior pituitary.
FSH and LH are secreted to start the development of the follicle. As follicle grows, estrogen secretion increases. The estrogen has a negative feedback on FSH, which causes it to stop being secreted.
As follicle reaches it's maximum growth at around 14th day of menstrual cycle, estrogen secretion reaches it's peak. This increased amount of estrogen causes a positive feedback to occur on the LH cells in the pituitary. LH secretion reaches maximum ( known as LH surge ) and ovulation occurs.
So, the correct option is ' 'Whereas a slow rise of estrogen inhibits the secretion of FSH, high concentration of estrogen have the opposite effect and stimulates the secretion of LH from the anterior pituitary'.

Suggest Corrections

Similar questions

Q. Refer to the given schematic representation of menstrual cycle showing three phases I, II and Ill.

Select the option that correctly matches these phases with the following events.

(i) FSH secreted by the anterior pituitary stimulates the ovarian follicle to secrete estrogen which stimulates the proliferation of the endometrium.

(ii) LH secreted by the anterior pituitary stimulates the development of corpus luteum which secretes progesterone.

(iii) Reduced production of LH from anterior pituitary causes degeneration of corpus luteum, thereby progesterone production is reduced.

Q. Very short answer type.
Which hormones inhibit secretion of FSH and LH by the anterior pituitary gland?

Q. When declining levels of estrogens and progesterone stimulate secretion of GnRH, is this a positive or negative feedback effect and why?

Q. High concentration of LH and estrogen lead to:

Q. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below:

Figure 1:

Testosterone regulation by cooperation between the hypothalamus, pituitary, and testicular endocrine glands. The major regulatory hormones involved are luteinizing hormone (LH), follicle-stimulating hormone (FSH) and gonadotropin-releasing hormone (GnRH).

When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. FSH and LH then stimulate the testis to produce testosterone.
How is homeostasis achieved when testosterone levels begin to rise?

Join BYJU'S Learning Program