Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 46, Problem 6TYU
Summary Introduction
Introduction:
Estrus cycle occurs in mammalian females. It comprises the recurring physiological changes that are induced by reproductive hormones. It occurs after sexual maturity and continues till death and is interrupted by anestrus phase or pregnancy. Some animals may display bloody vaginal discharge, but it often mistaken for menstrual cycle.
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|(A) Humans have some rather unique features to our reproductive behavior. One
strange one, relative to other animals, is female menopause. What might be the
selective advantage to this feature? (B) What selective forces may have led to the
evolution of menopause in humans?
If the ovum is not fertilized, the corpus luteum regresses, and the endometrium sloughs off to result in the first day of menstrual bleeding. The latter event would be duplicated, even if fertilization occurred, if receptors for which of the following hormones were occupied by an antagonist?
A) Dehydroepiandrosterone
B) Estradiol
C ) Estriol
D) Estrone
E) Progesterone
Which statement about human reproduction is false?(A) Fertilization occurs in the oviduct.(B) Spermatogenesis and oogenesis require differenttemperatures.(C) An oocyte completes meiosis after a sperm penetrates it.(D) The earliest stages of spermatogenesis occur closest to thelumen of the seminiferous tubules.
Chapter 46 Solutions
Campbell Biology
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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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
- Why is the ovum so much bigger than a sperm cell? 1)It already contains all the chromosomes that will determine the zygote's traits. 2)It must store enough food for the growth of the zygote into an embryo. 3)Its big size allows the sperm to locate it better inside the oviduct. 4)A big ega is easier to implant in the uterus after tertilization.arrow_forwardWhich of the following processes takes place simultaneously during the menstrual cycle? a) High LH levels and ovulation b) Reconstruction of the corpus luteum and increased release of progesterone from the ovaries c) Maximum LH release and menstruation (bleeding) d) Early follicular development and uterine lining e) Ovulation and menstruationarrow_forwardAn oophorectomized monkey is treated with high doses of estrogen. Which of the following changes is most likely to occur in the endometrium after 1 year of treatment? (A) Atrophy B Hyperplasia (C) Hypertrophy (D) Hypoplasia (E) Metaplasiaarrow_forward
- Which of the following is not properly paired?(A) seminiferous tubule—cervix(B) vas deferens—oviduct(C) testosterone—estradiol(D) scrotum—labia majoraarrow_forwardIf an egg cell were treated with EDTA, a chemical that bindscalcium and magnesium ions,(A) the acrosomal reaction would be blocked.(B) the fusion of sperm and egg nuclei would be blocked.(C) the fast block to polyspermy would not occur.(D) the fertilization envelope would not form.arrow_forwardThe main function of the acrosome reaction is to (a) activate the egg (b) improve sperm motility (c) prevent interspecific fertilization (d) facilitate penetration of the egg coverings by the sperm (e) cause fusion of the sperm and egg pronucleiarrow_forward
- Sperm need to be deposited in the vagina close to the time of ovulation because… a) Fertilisation needs to occur in the uterus b) The probability of fertilisation occurring in humans is about 25% c) The fusion of male and female gametes is the beginning of embryonic development d) Sperm and ovum are viable for a short time onlyarrow_forwarda) Give a detailed account of the hormonal control of the human menstrual cycle. Briefly explain the similarities and differences between oogenesis and spermatogenesis. b)arrow_forwardThe Mullerian ducts in female mammalian embryos develop into… a) The vas deferens b) The ovaries c) The oviduct and uterus d) The vagina e) The fimbriaarrow_forward
- 9.)What is the correct sequence of stages in the human menstrual cycle? a.) follicle stage - ovulation - corpus luteum - menstruation b.) follicle stage - ovulation - menstruation- corpus luteum c.) menstruation- ovulation - follicle stage -corpus luteum d.) menstruation - corpus luteum - ovulation - follicle stage 10.) Which of the following parts is where egg is being fertilized? a.) Vagina b.) Ovaries c.) Fallopian tube d.) Uterusarrow_forwardHow may positive feedback happen during parturition cycle (NOT uterine contraction cycle)? a) 0, b)1, c)2, d)3, e)4arrow_forwardMovement of spermatozoa through this component of the male reproductive pathway (6) occurs during the same phase of sexual activity as which of the following? (A) nitric oxide release (B) movement of sperm through the epididymis (from the head to the tail) (C) release of prostatic secretions (D) movement of sperm through the penile urethra (E) A and B (F) B and C (G) C and D (H) B, C, and Darrow_forward
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