5. What is the function of LH? Choose all that apply. stimulates enlargement of follicle in ovary stimulates ovulation Stimulates testes to produce testosterone Stimulates sperm production exerts negative feedback on the hypothalamus and/or anterior pituitary in males stimulates cells in testes to release nourishment for developing sperm and inhibin stimulates corpus luteum to release progesterone and estrogen (estradiol) stimulates thickening and/or maintenance of the endometrium (lining of uterus) 6. What is the function of estrogen (estradiol) and of progesterone? Choose all that apply. stimulates enlargement of follicle in ovary Stimulates release of FSH and LH in males stimulates release of FSH and LH in females stimulates ovulation stimulates thickening and/or maintenance of the endometrium (lining of uterus) in combination, exerts negative feedback on the hypothalamus and/or anterior pituitary so that an additional egg is not released 7. What is the function of testosterone? Choose all that apply. stimulates cells in testes to release nourishment for developing sperm and inhibin stimulates release of FSH and LH in females Stimulates release of FSH and LH in males Stimulates sperm production exerts negative feedback on the hypothalamus and/or anterior pituitary in males
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Discuss the positive feedback mechanisms by LH and FSH during the follicular and ovulation phase of the ovarian cycle. a. The stimulation of the anterior pituitary by GHRH secretes the hormones LH and FSH. The increasing amounts of these hormones stimulate several follicles in the ovary to start growing, but only one of these matures to release the egg. b. The stimulation of the anterior pituitary by GnRH secretes the hormones LH and TSH. The increasing amounts of these hormones stimulate several follicles in the ovary to start growing, but only one of these matures to release the egg. c. The stimulation of the anterior pituitary by GnRH triggers the secretion of the hormones LH and FSH. The increasing amounts of these hormones stimulate several follicles in the ovary to start growing, but only one of these matures to release the egg. d. The stimulation of the anterior pituitary by GHRH secretes the hormones LH and TSH. The increasing amounts of these hormones stimulate several follicles in the ovary to start growing, but only one of these matures to release the egg.
Spermatozoa cells, Sertoli cells: B) hypothalamus: C) Leydig cells: D) anterior pituitary gland. Prostate specific antigen (PSA) level test can determine the speediness of normal cancer signaling for generation of semen by the prostate, signaling for generation of mucous in the prostate, and signaling for generation of mucous by Leydig cells. 10) Based on what we know, the surgical removal of the seminal vesicles would likely cause sterility because PSA would not be produced. B) It would increase sterility because sperm would not be able to exit the body. C) It would likely reduce the volume of semen. D) It would enhance the fertilization potency of sperm in the uterus. E) It would cause the testes to migrate back into the abdominal cavity. H) The primary difference between estrous and menstrual cycles is that A) the endometrium shed by the uterus during the estrous cycle is reabsorbed, but the shed endometrium is excreted from the body during the menstrual cycle. B) Behavioral changes during estrous cycles are much less apparent than those of menstrual cycles. C) Season and climate have less pronounced effects on the estrous cycle than they do on menstrual cycles. D) Copulation normally occurs throughout the estrous cycle, whereas in menstrual cycles, copulation only occurs during the period surrounding ovulation. E) Most estrous cycles are of much longer duration compared to menstrual cycles. 12. Which is not associated with the uterine cycle? A) menstrual B) secretory C) spermatogenesis D) estrogen and progesterone 13) Ovulation is the follicular response to a burst of secretion of (choose the best answer) A) Luteinizing hormone B) progesterone C) inhibin D) prolactin E) estradiol. 14) The hypothalamic hormone that stimulates hormone secretion by the anterior pituitary gland is A) LH B) FSH C) inhibin D) GnRH E) estradiol. 15) Menopause is characterized by A) reduced synthesis of ovarian steroid hormones B) decline in production of the gonadotropin hormones by the adrenal gland C) cessation of the uterine endometrium menstrual cycle D) lack of blood supply to the ovaries. 16. Formation of human eggs usually takes place in the
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Explain the mechanisms by which hormones from the brain and ovaries interact, eventually leading to menstruation. a. After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. When no fertilization takes place, the corpus luteum degenerates and the progesterone level declines, initiating the breakdown of the myometrium and the start of the menstrual cycle. b. After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. When no fertilization takes place, the corpus luteum degenerates and the progesterone level declines, initiating the breakdown of the endometrium and the start of the menstrual cycle. c. After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then facilitates GnRH production, causing no other follicle to develop. When no fertilization takes place, the corpus luteum degenerates and the progesterone level declines, initiating the breakdown of the endometrium and the start of the menstrual cycle. d. After the release of the egg from the follicle, the corpus luteum is formed, which inhibits FSH and LH production, which then inhibits GnRH production, causing no other follicle to develop. When no fertilization takes place, the corpus luteum degenerates and the progesterone level rises, initiating the breakdown of the endometrium and the start of the menstrual cycle.
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