Question 16 What occurs in the uterus during the ovarian follicular phase? All of these occur...

Question 16

What occurs in the uterus during the ovarian follicular phase?

		All of these occur
		None of these occur
		menstruation
		thickening of the endometrium
		uterine proliferative phase

Expert Solution

What occura in the uterus during the ovarian follicular phase:-

All of these occur.

The follicular phase starts on the first day of menstruation and ends with ovulation. Prompted by the hypothalamus, the pituitary gland releases follicle stimulating hormone (FSH). This hormone stimulates the ovary to produce around five to 20 follicles (tiny nodules or cysts), which bead on the surface.

Each follicle houses an immature egg. Usually, only one follicle will mature into an egg, while the others die. This can occur around day 10 of a 28-day cycle. The growth of the follicles stimulates the lining of the uterus to thicken in preparation for possible pregnancy.

The ovarian follicular phase corresponds to the Proliferative phase of the uterus.

*Changes in Endometrium during Proliferative Phase :-

i. Endometrial cells proliferate rapidly

ii. Epithelium reappears on the surface of endometrium within the first 4 to 7 days

iii. Uterine glands start developing within the endometrial stroma iv. Blood vessels appear in the stroma

v. Proliferation of endometrial cells occurs continuously, so that the endometrium reaches the thickness of 3 to 4 mm at the end of proliferative phase.

All these uterine changes during proliferative phase occur because of the influence of estrogen released from ovary. On 14th day, ovulation occurs under the influence of LH. This is followed by secretory phase.

Sydney Mullin answered 1 year ago

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