Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 47, Problem 8TYU
Give examples of negative feedback and positive feedback in hormonal control of the human menstrual cycle. Why can high estradiol levels be considered a “readiness” signal from a follicle?
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Listed in the table below are the five major reproductive hormones that support ovulation in female mammals, including the
giant panda. Describe the role of each hormone in this process and the approximate time during the ovarian cycle that it
reaches peak levels.
Hormone
Gonadotropin-releasing
hormone (GnRH)
Estrogen
Luteinizing
hormone (LH)
Follicle stimulating
hormone (FSH)
Progesterone
Role in Regulation of the Menstrual Cycle Timing of Peak Level
What are the organizing effects of sex hormones? Compare the negative feedback loops in the male reproductive system with those of the female’s reproductive cycle. Describe an example of positive feedback involving estrogen that leads to ovulation. What are the hormonal changes during the luteal phase of the menstrual cycle?
If the release of LH were inhibited in a human female, which of the following events
would not occur?
O maturation of a primary follicle and oocyte
O ovulation of a secondary oocyte
O release of GNRH from the hypothalamus
release of FSH from the pituitary
O production of estrogen by follicle cells
Chapter 47 Solutions
Biological Science (7th Edition)
Ch. 47 - Prob. 1TYKCh. 47 - Prob. 2TYKCh. 47 - Prob. 4TYKCh. 47 - Summarize the experimental evidence that Daphnia...Ch. 47 - Prob. 6TYUCh. 47 - 7. How do spermatogenesis and oogenesis in humans...Ch. 47 - 8. Give examples of negative feedback and positive...Ch. 47 - Prob. 9TYPSSCh. 47 - Prob. 11PIATCh. 47 - Prob. 12PIAT
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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.arrow_forwardOutline the roles of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the ovarian cycle of a human female.arrow_forwardFigure 43.17 Which of the following statements about the menstrual cycle is false? Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. Menstruation occurs just after LH and FSH levels peak. Menstruation occurs after progesterone levels drop. Estrogen levels rise before ovulation, while progesterone levels rise after.arrow_forward
- 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 maintainedarrow_forwardList four events that are triggered by the surge of LH at the midpoint of the menstrual cycle.arrow_forwardFigure 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.arrow_forward
- Distinguish between: a. seminiferous tubule and vas deferens b. sperm and semen c. Leydig cells and Sertoli cells d. primary oocyte and secondary oocyte e. follicle and corpus luteum f. the three phases of the menstrual cyclearrow_forwardDescribe the function of each of the following hormones in the uterine and ovarian cycles: GnRH, FSH, LH, estrogens, progesterone, and inhibin.arrow_forwardComplete the following feedback loop for estrogen between day 12 and 14 of ovarian cycle.Pick one from each drop-down menu: (In the photos attached are the options for the feedback loop.)arrow_forward
- During the follocular phase of the ovarian cycle, what does an increase in estrogen concentrations correlate with? 1-The degradation of a follicle containing an egg(oocyte) 2-The formation of the corpus luteum 3-The maturation of a follicle containing an egg(oocyte) 4- The degradation of teh corpus luteumarrow_forwardDiscuss the hypothalamic-pitiutary-ovarian and the physiologic basis for the interplay of the various hormones involved in the axis.arrow_forwardUnlike male gonadotropins, female gonadotropins are able to promote the development of a single optimal dominant follicle during most cycles with the release of a single gamete from an LH surge and then optimization of the uterine environment for implantation. To understand pathologies in this complex system, one must understand the ideal steps within the normal menstrual cycle. Which of the following statements best describes the role of FSH in menstruation? O FSH induces granulosa cell LH receptors within the dominant follicle. O FSH stimulates follicular growth only in the early preantral stage. ( ) FSH stimulates granulosa cell androgen production. O FSH increases its own receptor numbers on theca cells. O FSH induces theca cell aromatase.arrow_forward
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