Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 38.6, Problem 1TYK
Summary Introduction
Introduction: Hormones can be defined as chemical substances that are produced in the body which regulates the action of some cells or organs. Many hormones are released by special glands such as the thyroid hormone that is formed by the thyroid gland.
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Which of the following is/are true with regards to hormones in the reproductive tract?
Estrogen secretion is stimulated exclusively by LH.
Progesterone is secreted by ovarian follicles & the corpus luteum.
Progesterone secretion is stimulated exclusively by FSH.
Estrogen is secreted by ovarian follicles & the corpus luteum.
All of the above
Which of the following events does NOT
occur initially during a female reproductive
cycle? *
Progesterone promotes the secretory
phase.
FSH & LH stimulates development ovarian
follicles& secretion of Estrogen.
Estrogen promotes proliferative & secretory
phases.
FSH & LH stimulates development ovarian
follicles & secretion of Progesterone.
Hypothalamus release GNRH, which
stimulates the Pituitary Gland to secrete
FSH & LH.
What is the expected effect on reproduction on an individual with hormone levels shown above? Identify two physiological changes that will not occur due to the atypical hormone levels shown above.
The graph above shows the estrogen and progesterone levels of an individual during a menstrual cycle of 28 days. The top light blue line indicates the progesterone levels and the bottom purple line indicates the estrogen levels. This individual is in luteal phase.This individual can be expected to have low levels of FSH and LH.
Chapter 38 Solutions
Principles of Biology
Ch. 38.1 - Prob. 1TYKCh. 38.1 - The synthesis of which class of hormone requires...Ch. 38.2 - Prob. 1BCCh. 38.2 - Prob. 1TYKCh. 38.2 - Prob. 2TYKCh. 38.3 - Prob. 1BCCh. 38.3 - Prob. 1TYKCh. 38.3 - Prob. 2TYKCh. 38.4 - Prob. 1CCCh. 38.4 - Prob. 1TYK
Ch. 38.5 - Some children with short stature can be...Ch. 38.5 - Prob. 2TYKCh. 38.5 - Prob. 1CCCh. 38.6 - Prob. 1TYKCh. 38.7 - Prob. 1TYKCh. 38 - Prob. 1TYCh. 38 - Prob. 2TYCh. 38 - Which is false about polypeptide hormones? They...Ch. 38 - Which is false about the control of hormones? Many...Ch. 38 - Prob. 5TYCh. 38 - Prob. 6TYCh. 38 - Prob. 7TYCh. 38 - Prob. 8TYCh. 38 - Prob. 9TYCh. 38 - Prob. 10TYCh. 38 - What is the function of leptin, and what is the...Ch. 38 - Prob. 2CCQCh. 38 - A principle of biology is that living organisms...Ch. 38 - Prob. 1CBQCh. 38 - Discuss the role of the different steroid hormones...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Figure 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_forwardWhich of the following is/are true with regards hormones in the reproductive tract? * All the choices Progesterone is secreted by ovarian follicles & the corpus luteum. Estrogen secretion is stimulated exclusively by LH. Progesterone secretion is stimulated exclusively by FSH. Estrogen is secreted by ovarian follicles & the corpus luteum.arrow_forwardWhat does the graph show about estrogen and progesterone before and after ovulation? Please choose from one choice below. Before ovulation: Progesterone level is higher than estrogen; After ovulation: Estrogen level is higher than progesterone Before ovulation: Estrogen level is lower than progesterone; After ovulation: Progesterone level is higher than estrogen Before ovulation: Estrogen level is higher than progesterone; After ovulation: Progesterone level is higher than estrogen Before ovulation: Progesterone level is higher than estrogen; After ovulation: Estrogen level is lower than progesteronearrow_forward
- Polycystic ovarian syndrome (PCOS) is an endocrine disorder. PCOS may result in irregular periods, elevated levels of male hormones, and enlarged ovaries with fluid filled sacs called cysts.Doctors may prescribe birth control pills containing only progesterone to help regulate periods and reduce symptoms.Progesterone plays an important role in the ovarian and uterine cycles. Describe the functions of progesterone during the cycle.arrow_forwardHormone replacement therapy was advertised first to women in the 1990s as a way of increasing their youthfulness. Hormone replacement therapy today is usually taking pills to increase someone's estrogen or testosterone supply. Pick either estrogen or testosterone. For either one: 1) How does your chosen sex hormone work at the cellular and at the molecular level? 2) How do these hormones improve the reproductive system as a whole? 3) What are the benefits of doing hormone replacement therapy? 4) What are the harms of doing hormone replacement therapy? 5) Who would be an ideal candidate for hormone replacement therapy?arrow_forwardListed 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 Levelarrow_forward
- Polycystic ovarian syndrome (PCOS) is an endocrine disorder. PCOS may result in irregular periods, elevated levels of male hormones, and enlarged ovaries with fluid filled sacs called cysts.Doctors may prescribe birth control pills containing only progesterone to help regulate periods and reduce symptoms.Progesterone plays an important role in the ovarian and uterine cycles. Describe the functions of progesterone during the cycle (at LEAST 2).arrow_forwardWhich of the following is NOT TRUE? A) Menopause is marked by elevated levels of gonadotropins. A spermatozoon can survive for more than five days in a female reproductive tract. C) The proliferative endometrial phase is promoted by progesterone. Synthetic estrogens act as contraceptives by preventing the ovarian luteal phase. The hormonal basis of stress-induced amenorrhea is due to the influence of the limbic system on GNRH secretion.arrow_forwardMatch the responses stimulated by hormones in the male reproductive system with the hormone given below that stimulates the response. Stimulates the release of FSH and LH Stimulates the development of the sex organs, starting at puberty, and promotes gamete formation Maintains the male reproductive system in adulthood; develops and maintains male secondary sexual characteristics; increases muscle mass and aggressive behaviour Produced by Sertoli cells in males; inhibits FSH production in a negative feedback loop Stimulates the interstitial cells to produce and secrete testosterone LH FSH Testosterone GnRH Inhibinarrow_forward
- 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?arrow_forwardExplain the relationship of the following pairs of terms. Briefly explain its relations 1.) Positive Feedback and oxytocin 2.) Negative Feedback and insulin 3.) Ovary and estrogen 4.) Testis and testosterone 5.) Neuron and nerve impulsearrow_forwardAlthough the most effective form of an oral contraceptive for woman contain estrogen and progestin, some birth control pills contain a small dose of progestin-only. This is because there are many risks and side effects. Which of the following statements is NOT a reason for using a progestin-only oral contraceptive? Select one: A. progesterone maintains the corpus luteum as corpus luteum release a large amount of progesterone and estrogen. B. progesterone suppresses the maturation of follicles, thereby preventing ovulation of a mature ovum. C. progestin-only oral contraceptives prevent the production of FSH and LH in the anterior pituitary. D. progesterone suppresses the production of GnRH in the hypothalamus.arrow_forward
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