Ovarian Cycle and Hormonal Changes

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What is the primary function of human chorionic gonadotropin (HCG) during pregnancy?

To stimulate ovulation

To prevent corpus luteum degeneration (correct)

To regulate estrogen levels

To induce menstruation

During the proliferative phase of the endometrial cycle, what is the primary effect of estrogen?

Maintaining the corpus luteum

Inducing menstruation

Stimulating the growth of endometrial glands (correct)

Regulating the thickness of the stroma

What is the primary consequence of a decline in LH levels below a certain threshold in the ovarian cycle?

Corpus luteum degeneration (correct)

HCG secretion

Stimulated ovulation

Increased estrogen production

During pregnancy, what is the primary mechanism that prevents the recycling of the ovarian cycle?

HCG secretion Signup and view all the answers

What is the characteristic of the stroma during the proliferative phase of the endometrial cycle?

Dense and compact with infrequent vascular structures Signup and view all the answers

What is the primary consequence of a positive feedback mechanism on the pituitary in the ovarian cycle?

Increased FSH release Signup and view all the answers

What is the primary hormone responsible for the secretory phase of the endometrium?

Progesterone Signup and view all the answers

During which phase of the menstrual cycle does the endometrium undergo the most significant thickening and ripening?

Secretory phase Signup and view all the answers

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 Signup and view all the answers

What is the primary mechanism responsible for the onset of menstruation?

Decreased secretion of estrogen and progesterone Signup and view all the answers

What is the name of the process by which the spiral arteries become clearly visible and coiled during the secretory phase?

Spiral arteriolarization Signup and view all the answers

What is the approximate thickness of the endometrium during the secretory phase?

10 mm Signup and view all the answers

What is the primary function of the follicular phase in the ovarian cycle?

To produce estrogen Signup and view all the answers

What is the fate of follicles that do not reach maturity during the follicular phase?

They undergo follicular atresia Signup and view all the answers

What is the diameter of a mature Graffian follicle?

18-24mm Signup and view all the answers

What is the structure that surrounds the oocyte in a mature Graffian follicle?

Zona pellucida Signup and view all the answers

What is the definition of ovulation?

The release of an oocyte from a mature Graffian follicle Signup and view all the answers

What hormone is produced by the follicular phase?

Estrogen Signup and view all the answers