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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Question
Chapter 39.3, Problem 1CC
Summary Introduction
To analyze:
The surge in blood concentration of FSH and LH in human males.
Introduction:
When a human male attains puberty or sexual maturity, his hypothalamus begins producing gonadotropin-releasing hormone (GnRH) in high amount. GnRH in turn stimulates pituitary gland to produce follicle stimulating hormone (FSH) and luteinizing hormone (LH). FSH and LH play important role in development of male gonads.
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Describe the negative feedback mechanisms that control the secretion of FSH and LH in females.
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Chapter 39 Solutions
Principles of Biology
Ch. 39.1 - Choose the correct statement. The majority of...Ch. 39.2 - In _________ gametes are released in large numbers...Ch. 39.2 - In which way is gametogenesis similar in males and...Ch. 39.3 - Prob. 1CCCh. 39.3 - Prob. 1TYKCh. 39.3 - Prob. 2TYKCh. 39.4 - Prob. 1BCCh. 39.4 - Prob. 2BCCh. 39.4 - Prob. 1CCCh. 39.4 - Prob. 1TYK
Ch. 39.4 - Prob. 2TYKCh. 39.5 - The three germ layers of triploblasts are...Ch. 39.5 - Choose the correct sequence of events. cleavage...Ch. 39.6 - Under what condition(s) might you expect temporary...Ch. 39.6 - Prob. 2TYKCh. 39 - Prob. 1TYCh. 39 - Prob. 2TYCh. 39 - Spermatogonia are haploid germ cells. d. have...Ch. 39 - Prob. 4TYCh. 39 - Prob. 5TYCh. 39 - Prob. 6TYCh. 39 - A major function of FSH is to stimulate the...Ch. 39 - Prob. 8TYCh. 39 - Prob. 9TYCh. 39 - Cells of the neural crest give rise to the central...Ch. 39 - Prob. 1CCQCh. 39 - Prob. 2CCQCh. 39 - Prob. 3CCQCh. 39 - Describe the major events in animal development...Ch. 39 - Describe the events of the ovarian and uterine...
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- Describe the main actions performed by oxytocin. Why parturition can occur without elevated levels of plasma oxytocin?arrow_forwardContrast the effects of FSH and LH.arrow_forwardWomen with inadequate secretion of GnRH are often treated for their infertility with drugs that mimic the action of this hormone. Can you suggest a possible reason that such treatment is often associated with multiple births?arrow_forward
- Men 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_forwardSuppose an adult male developed a tumor in one of his testes that resulted in abnormally high levels of testosterone.What would happen to his levels of GnRH, FSH, and LH?arrow_forwardDescribe how the cyclic increase and decrease in FSH and LH is produced.arrow_forward
- If a castrated male rat was injected with testosterone over several weeks, why would his prostate increase in size but his testes decrease in size? What would you expect to happen to his circulating levels of LH? What would happen to his body weight?arrow_forwardDescribe the hormonal control of spermatogenesis in terms of the hypothalamic-pituitarygonadal axis (HPG axis) – in this case, the hypothalamic-pituitary-testes axisList the anabolic and androgenic effects of testosteronearrow_forwardestrogen is produced by: hypothalamus, anterior pituitary, the egg, the uterus, or the follicles.?arrow_forward
- If an intact rat was injected with testosterone over several weeks, why would his prostate increase in size but his testes decrease in size? What would you expect to happen to his circulating levels of LH? What about his circulating levels of GnRH?arrow_forwardA person’s hypothalamus is geared to produce relatively constant levels of FSH and LH throughout reproductive life rather than pulses of high release. This person is: a. Male b. Female c. Either a male or female d. Neither a male or femalearrow_forwardPlease draw a feedback loop for an individual who has secondary hypogonadism and is receiving testosterone replacement therapy. Would there be an excess amount of GnRH or a low amount? And does the testosterone feedback to anywhere or is it even possible to create a negative feedback loop for this?arrow_forward
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