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- Figure 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.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 maintainedWhat directly triggers the release of progesterone? The release of FSH O Ovulation O Fertilization O The peak of estrogen
- Ovaries secrete the hormone estrogen in greater amounts after menstruationand a few days before ovulation. Among its many effects, estrogen causesthe up-regulation of receptors in the uterus for another hormone secretedby the ovaries, called progesterone. Progesterone, which is secreted afterovulation, prepares the uterine wall for possible implantation of an embryo.Pregnancy cannot occur unless the embryo implants in the uterine wall.Predict the consequence of the ovaries’ secreting too little estrogen.How do follicles influence FSH and LH levels at the end of the follicular phase, right before ovulation? Follicles release high quantities of estrogen, which result in a large increase in LH and a small increase in FSH O Follicles release high quantities of progesterone, which result in a large increase in LH and a small increase in FSH O Follicles release low quantities of estrogen, whch result in a large increase in LH O Follicles release low quantities of progesterone, which result in a large increase in LH and a small increase in FSHConcerning events duringthe periods of life howdifferent is the gametogenesisin women and in men?
- If the ovaries are removed from a 20-year-old female, what happens tothe levels of GnRH, FSH, LH, estrogen, and progesterone in herblood? What side effects would these hormonal changes have on hersexual characteristics and sexual behavior?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?If the ovaries are removed from a postmenopausal female, what happensto the levels of GnRH, FSH, LH, estrogen, and progesterone in herblood? What symptoms would you expect to observe?
- 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.What type of cells surround the oocyte in a unilaminar follicle? O Primordial Cells O Unilaminar Cells O Intersticial Cells O Follicular Cells O Zona PellucidaWhat statement best explains the role of progesterone in menstruation?a. Produces corpus luteumb. It prepares the uterus for menstruationc. It is a steroidal hormone that results in some significant endometrial changesd. Initiate this phase by the formation of the corpus luteumWhich of the following is/are NOT a function of progesterone and estrogen:a. Inhibits the production of LH and FSHb. Causes the hypothalamus to release gonadotropin releasing hormonec. Maintains the endometrium for pregnancyd. Causes the follicle to mature into a graafian follicle