Select the correct statement about the hormonal events of the ovarian cycle A. High estrogen levels...

Select the correct statement about the hormonal events of the ovarian cycle A. High estrogen levels result in a surge of LH release. B. The LH surge stimulates further development of the secondary oocyte C. Rising levels of estrogen start follicle development D. The follicle begins to secrete progesterone in response to estrogen stimulation

Expert Solution

Answer) option A - High oestrogen levels result in surge of LH release.

Explanation-

High oestrogen levels (oestrogen surge) has a positive feedback effect i.e it increases the responsiveness of the pituitary gland to GnRH (gonadotropin releasing hormone), which induces within 24 hours a burst of LH secretion(LH surge).

This cause a sudden rise in LH (luteinizing hormone) concentration at the mid-cycle i.e about 14th day.

Ovulation occurs after LH surge, so LH hormone is also known as ovulating hormone.

Other options are incorrect -

Explanation-

Option B- As the LH surge do not stimulates the further development of secondary oocyte.

LH surge causes ovulation (release of ovum from the ovary).

The development of secondary oocyte occurs, when ovum (egg) is fertilized by sperm.

Option C- As rising levels of oestrogen do not start follicle development.

Follicular development occurs due to follicular stimulating hormone (not by oestrogen hormone)

Follicular stimulating hormone stimulates growth and development of ovarian follicles in females.

Option D- As the follicle do not secrete progesterone in response to oestrogen stimulation.

Progesterone is secreted by corpus luteum and placenta.

After ovulation, corpus luteum is formed. Luteal cells of the corpus luteum secretes progesterone.

Sydney Mullin answered 1 year ago

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