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- Which hormone causes FSH and LH to be released? a. testosterone b. estrogen c. GnRH d. progesteroneFSH and LH release from the anterior pituitary is stimulated by. TSH GnRH T3 PTHFigure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.
- Which hormone is primarily responsible for the contractions during labor? a. oxytocin b. estrogen c. -HCG d. progesteroneThe 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 .increased levels of estrogen and progesterone will result in ( negative, positive, increase, decrease) feedback to the hypothalamus and anterior pituitary to ( negative, positive, increase, decrease), ( LH, FSH, GnRh, LH AND FSH) production. This normally occurs during the ( FOLLICULAR STAGE, LUTEAL STAGE ) Decreased levels of estrogen and progesterone will result in ( negative, positive, increase, decrease) feedback to the hypothalamus and anterior pituitary to ( negative, positive, increase, decrease), (LH, FSH, GnRh, LH AND FSH) production. This normally occurs during the ( FOLLICULAR STAGE, LUTEAL STAGE ). Extremely high levels of estrogen near the end of the follicular phase will result in ( negative, positive, increase, decrease) feedback to the hypothalamus and anterior pituitary to release a large amount of ( LH, FSH, GnRh, LH AND FSH) to trigger ovulation. Some hormones are used in oral contraceptive pills to suppress the release of ( LH, FSH, GnRh, LH AND FSH) Without…
- Right before the ovulation, the maturate follicle secretes high levels of estrogen which switches from negative to positive feedback regulation of the HPG axis. Positive feedback regulation of estrogen will result in __________ of estrogen levels, leading to an ____________ surge further increase; progesterone further increase; LH decrease; progesterone decrease, LHGonadocorticoid A. synthesized by the adrenal medulla are primarily androgens. B. Production by the adrenal gland is insignificant as compared to sex hormone release from the gonads during late puberty C. Inhibition (of secretion) is highly dependent on a negative feedback loop involving ACTH D. Hypersecretion can result in androgenital syndrome also called feminization E. All of these are correctWhat is the purpose of androgen binding protein by Sertoli cells of the testes? a. Potentiates the actions of testosterone at target cells b. Prevents testosterone from diffusing out the testes c. Regulates level of testosterone via negative feedback control at the level of the anterior pituitary d. To stimulate testosterone production
- Match four of the hormones of the negative feedback numbered above with their function given below. Function: Hormone: Stimulates the development of an ovum Answer Stimulates the corpus luteum to release progesterone Answer Suppresses GnRH, FSH, and LH production in the follicular phase Answer Suppresses GnRH, FSH, and LH production in the luteal phase AnswerBirth control pills are oral contraceptives taken by women to prevent pregnancies. the most effective forms of birth control pills contain estrogen and a small amount of progestin ( a synthetic hormone that mimics the effect of progesterone). The role of estrogen in the birth control pills is to: Select one: A. reduce the progesterone levels in the blood to limit the endometrium. B. negatively feedback to the anterior pituitary to suppress the production of GnRH. C. suppress the shedding of the endometrium, thus preventing mestruation. D. prevent the rise in the FSH and LH levels, thereby preventing follicle's maturation.