18 Questions
What is the primary function of human chorionic gonadotropin (HCG) during pregnancy?
To prevent corpus luteum degeneration
During the proliferative phase of the endometrial cycle, what is the primary effect of estrogen?
Stimulating the growth of endometrial glands
What is the primary consequence of a decline in LH levels below a certain threshold in the ovarian cycle?
Corpus luteum degeneration
During pregnancy, what is the primary mechanism that prevents the recycling of the ovarian cycle?
HCG secretion
What is the characteristic of the stroma during the proliferative phase of the endometrial cycle?
Dense and compact with infrequent vascular structures
What is the primary consequence of a positive feedback mechanism on the pituitary in the ovarian cycle?
Increased FSH release
What is the primary hormone responsible for the secretory phase of the endometrium?
Progesterone
During which phase of the menstrual cycle does the endometrium undergo the most significant thickening and ripening?
Secretory phase
What is the name of the layer of the endometrium that does not undergo cyclic changes and is responsible for regenerating the endometrium after menstruation?
Basal layer
What is the primary mechanism responsible for the onset of menstruation?
Decreased secretion of estrogen and progesterone
What is the name of the process by which the spiral arteries become clearly visible and coiled during the secretory phase?
Spiral arteriolarization
What is the approximate thickness of the endometrium during the secretory phase?
10 mm
What is the primary function of the follicular phase in the ovarian cycle?
To produce estrogen
What is the fate of follicles that do not reach maturity during the follicular phase?
They undergo follicular atresia
What is the diameter of a mature Graffian follicle?
18-24mm
What is the structure that surrounds the oocyte in a mature Graffian follicle?
Zona pellucida
What is the definition of ovulation?
The release of an oocyte from a mature Graffian follicle
What hormone is produced by the follicular phase?
Estrogen
This quiz covers the hormonal changes that occur during the ovarian cycle, including the roles of LH, FSH, estrogen, and progesterone, and how pregnancy affects these processes.
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