Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Question
Chapter 46, Problem 46.4CR
Summary Introduction
To explain: Anabolic steroids lead to reduced sperm counts.
Concept introduction:
Endocrine system coordinates and controls the reproduction in mammals. The hypothalamus releases gonadotropin-releasing hormone that stimulates the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Both FSH and LH are gonadotropins, as they stimulate gonads—testes in males and ovaries in females. The secretion levels of hormones are based on the feedback regulation.
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A 38-year-old male is upset about his low sperm count and visits a "practitioner" who commonly advertises his miracle cures of sterility. The practitioner is a quack who treats conditions of low sperm count with megadoses of testosterone. Although his patients experience a huge surge in libido, their sperm count is even lower after hormone treatment.
a) Which two glands would be responsive to the megadose of testosterone?
b) Identify the two hormones that would be affected by the megadose of testosterone. Would their levels increase or decrease?
c) What role, if any, would either of the affected hormones have on the man's reduced sperm count?
Chapter 46 Solutions
Bio 121 Campbell Biology Truman College
Ch. 46.1 - Compare and contrast the outcomes of asexual and...Ch. 46.1 - Parthenogenesis is the most common form of asexual...Ch. 46.1 - WHAT IF? If a hermaphrodite self-fertilizes, will...Ch. 46.1 - Prob. 4CCCh. 46.2 - How does internal fertilization facilitate life on...Ch. 46.2 - What mechanisms have evolved in animals with (a)...Ch. 46.2 - MAKE CONNECTIONS What are the shared and distinct...Ch. 46.3 - Why might frequent use of a hot tub make it harder...Ch. 46.3 - Prob. 2CCCh. 46.3 - WHAT IF? If each vas deferens in a male was...
Ch. 46.4 - How are the functions of FSH and LH in females and...Ch. 46.4 - How does an estrous cycle differ from a menstrual...Ch. 46.4 - WHAT IF? If a human female begins taking...Ch. 46.4 - Prob. 4CCCh. 46.5 - Prob. 1CCCh. 46.5 - In what ways are tubal ligation and vasectomy...Ch. 46.5 - Prob. 3CCCh. 46 - Would a pair of haploid offspring produced by...Ch. 46 - Identify which of the following, if any, are...Ch. 46 - How does the difference in size and cellular...Ch. 46 - Prob. 46.4CRCh. 46 - Prob. 46.5CRCh. 46 - Prob. 1TYUCh. 46 - In male mammals, excretory and reproductive...Ch. 46 - Prob. 3TYUCh. 46 - Prob. 4TYUCh. 46 - Prob. 5TYUCh. 46 - Prob. 6TYUCh. 46 - Prob. 7TYUCh. 46 - Prob. 8TYUCh. 46 - DRAW IT In human spermatogenesis, mitosis of a...Ch. 46 - Prob. 10TYUCh. 46 - SCIENTIFIC INQUIRY You discover a new egg-laying...Ch. 46 - WRITE ABOUT A THEME: ENERGY AND MATTER In a short...Ch. 46 - SYNTHESIZE YOUR KNOWLEDGE A female Komodo dragon...
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- Did the low sexual desire may be linked to excessive activity of the neurotransmitters serotonin and dopamine ?arrow_forwardWhat effect will the addition of a sulfate group have on the properties of Testosterone? Why is this important? Note:Need answer urgently (within 30 minutes)arrow_forwardwhat is the importance of the female hormone oxytocin? how important is the hormone testosterone for male during puberty age?arrow_forward
- Select the best answer or answers from the choices given: Testosterone is to the male as which hormone is to the female? (a) luteinizing hormone, (b) progesterone, (c) estrogen, (d) prolactin.arrow_forwardIn a small study, 12 men with testicular cancer and 12 without were matched on age and asked about their history of testosterone use. The results are in the table. What is the odds ratio for the association between testosterone and testicular cancer? Pair Number With Testicular Cancer Without Testicular Cancer 1 Testosterone No Testosterone 2 No Testosterone No Testosterone 3 Testosterone Testosterone 4 Testosterone Testosterone 5 Testosterone No Testosterone 6 No Testosterone No Testosterone 7 Testosterone No Testosterone 8 Testosterone No Testosterone 9 No Testosterone Testosterone 10 No Testosterone No Testosterone 11 No Testosterone No Testosterone 12 No Testosterone Testosteronearrow_forwardWhat's the difference between estrogen and progestorone? How are each produced? What do they do?arrow_forward
- Is it advisable for a young man to start having sex during puberty?arrow_forwardFigure 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_forwardWhy do you think a male may have low LH levels and how/why would that affect sperm production? keep in mind that the * male has been taking a synthetic testosterone supplement for several months*arrow_forward
- Which of the following would most likely reduce levels of active estrogen to potentially modulate cancer risk? a) Increased alcohol consumption b) Increased dietary folate c) Decreased levels of sex-hormone-binding globulin d) Increased phytoestrogen intakesarrow_forwardWhat is the purpose of having a specific receptor for estrogen within the cell?arrow_forwardMen with decreased anterior pituitary gland function often have decreased sperm production as well as low testosterone concentrations. Would you expect the administration of testosterone alone to restore sperm production to normal?arrow_forward
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