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- Watch this video (http://openstaxcollege.org/l/ovulation) to observe ovulation and its initiation in response to the release of FSH and LH from the pituitary gland. What specialized structures help guide the oocyte from the ovary into the uterine tube?Match each hormone with its effect. oxytocin a. growth of facial hair testosterone b. uterus contracts LH c. LH, FSH are released GnRH d. surge causes ovulation FSH e. follicle develops HCG f. milk is produced prolactin g. corpus luteum is maintainedFigure 43.15 Which of the following statements about hormone regulation of the female reproductive cycle is false? LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol.
- Outline the roles of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the ovarian cycle of a human female.Which hormone causes FSH and LH to be released? a. testosterone b. estrogen c. GnRH d. progesteroneDoes the hypophysis-ovaries endocrine axis work inthe same way duringpregnancy as in non-pregnantwomen? If pregnancy doesnot occur how does anothermenstrual cycle begin?
- What are the hormonesthat promote the release ofthe female gamete from thefollicle and at which day of themenstrual cycle does thisphenomenon happen? What isthis event called?GnRH can be used to treat some females who want to have childrenbut have not been able to get pregnant. Explain why it is critical toadminister the correct concentration of GnRH at the right time duringthe menstrual cycle.The primary purpose of gonadotropin-releasing hormone (GnRH) is to stimulate the : Breakdown of the endometrium in the menstrual flow . Development of the woman's breasts for lactation . Secretion of follicle stimulating hormone (FSH) and luteinizing hormone (LH ) from the anterior pituitary gland . Growth of pubic and axillary hair .
- What effect would a continuous supply of exogenous estrogen or progesterone have on an adult female human? Will it: A) Cause no oocyte maturation B) Have more frequent ovulation C) Contain a stronger surge in LH production at mid-cycle D) Ovulation of multiple oocytes per cycle E) High, steady FSH productionKatie was getting nervous. At 16, she was the only one in her group offriends who had not started menstruating. Katie had always dreamedof having three beautiful children someday and she was worried. Hermother took her to see Dr. Josephine, who ordered several blood tests.When the results came back, Dr. Josephine gently explained to Katieand her mother that Katie would never be able to have children andwould never menstruate. Dr. Josephine then asked Katie to wait in theouter room while she spoke privately to her mother. She explained toKatie’s mom that Katie has androgen insensitivity syndrome. ThoughKatie is genetically male and her gonads produce more of the malereproductive hormone, testosterone, than the female reproductivehormone, estrogen, Katie did not reflect the tissue changes expected.What malfunction in Katie’s body would cause this? Why does Katie’sbody look feminine if she is genetically male?Why does the estrogen released at the follicular phase inhibit FSH levels by a negative feedback mechanism? A high level of FSH will cause ovulation. A high level of FSH will cause menstruation. To ensure that the endometrium is ready to receive an embryo. To prevent multiple follicles from maturing at the same time.