During the menstrual phase, uterine endometrium, epithelial glands, and connective tissues are broken. This is due to

Over production of progesterone

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Lack of progesterone

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Over secretion of FSH

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Lack of estrogen

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Solution

The correct option is D Lack of progesterone
Menstruation or the menstrual phase involves the shedding off of the uterine endometrium, epithelial glands, and connective tissues via the vaginal canal. On events that fertilization of the ovum released by the ovaries does not take place, the progesterone levels dip down and this results in the shedding of the extra, surrounding tissues of the uterus along with the unfertilized and degenerating ovum.
So, the correct answer is 'Lack of progesterone'.

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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.

With respect to the assertion and reason given, choose the correct answer.

Assertion [A]: During secretory phase, low levels of progesterone inhibit the production of FSH.
Reason [R]: As long as progesterone levels are low, the endometrium is maintained and no new follicles are stimulated.

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