Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 49, Problem 16TYK
Summary Introduction

To review:

Drug design of a birth control drug that would prevent conception by interfering with fertilization.

Introduction:

Human fertilization is the union of a human egg and sperm, which occurs in the fallopian tube of a female. The result of fertilization is the production of a zygote cell, or fertilized egg. It occurs when sperm fuse into an ovum.

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combination birth control pills contain estrogen and progestin. A typical pill packet contains 3 weeks of active hormones and 1 week of placebo pills.  During the week of placebo pills, menstruation occurs. Use your knowledge of the hormonol control of the female reproductive system to: 1) Explain how the pills alter the feedback pathways of FSH and LH to prevent pregnancy. 2) Explain why menstruation occurs during the placebo week
In vitro fertilization (IVF) is a common assistive reproductive technology for couples who are struggling to conceive naturally; however, the success rate of IVF is, at best, about 55%. Researchers seeking to improve the success of IVF need to observe the interaction between sperm and eggs in order to better understand the factors that favour fertilization. Obviously, larger sperm and eggs would be easier to observe, even with the aid of microscopy. On this basis, which of the following vertebrate groups might be a good model for studying IVF because they are likely contain species with large sperm and eggs? Group of answer choices a) fish b) amphibians c) reptiles d) birds e) mammals
Previously, birth control methods involving hormones were created only for females. However, a new form of hormonal contraceptive has been developed for males. The contraceptive involves a monthly injection of the hormone testosterone. Testosterone injections showed a 99% efficacy in preventing pregnancy. Which of the following rows correctly identifies the expected levels for the hormones involved in the production of sperm and the hormone that stimulates the production of testosterone in a male receiving testosterone injections, respectively? Select one: a. Sperm Production Testosterone Production Low FSH Low LH b. Sperm Production Testosterone Production Low LH Low FSH c. Sperm Production Testosterone Production High FSH High LH d. Sperm Production Testosterone Production High LH High FSH
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