Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Chapter 52, Problem 1A
Summary Introduction
Introduction:
Estrous cycle is also known as estrus cycle. In this cycle the physiological changes are induced in mammalian therian females by reproductive hormones. This cycle starts after the sexual maturity. The menstrual cycle is the natural changes that occur in the reproductive tract of females. This allows females to conceive each month.
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During the menstrual cycle, the degradation of the corpus luteum causes what?
A) The decrease of progesterone levels and the thickening of the endometrium.
B) The decrease of estrogen levels and increase of progesterone levels.
C) The decrease of estrogen levels and the thickening of the endometrium.
D) the decrease of progesterone levels and menses(period)
Which 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 menstruation
Which of the following is a true statement?(A) All mammals have menstrual cycles.(B) The endometrial lining is shed in menstrual cycles butreabsorbed in estrous cycles.(C) Estrous cycles are more frequent than menstrual cycles.(D) Ovulation occurs before the endometrium thickens inestrous cycles.
Chapter 52 Solutions
Biology
Ch. 52 - You have discovered a new organism living in tide...Ch. 52 - Prob. 2UCh. 52 - Prob. 3UCh. 52 - Which of the following structures is the site of...Ch. 52 - FSH and LH are produced by the a. ovaries. b....Ch. 52 - Prob. 6UCh. 52 - Mutations that affect proteins in the acrosome...Ch. 52 - In humans, fertilization occurs in the____, and...Ch. 52 - The testicles of male mammals are suspended in the...Ch. 52 - Prob. 1A
Ch. 52 - Which of the following is a major difference...Ch. 52 - Prob. 3ACh. 52 - Internal and external fertilization differ in that...Ch. 52 - Prob. 1SCh. 52 - Why do you think that amphibians and many fish...Ch. 52 - How are the functions of FSH and LH similar in...Ch. 52 - Prob. 4SCh. 52 - Why are all parthenogenic parents female?
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- Which of the following statements about the menstrual cycle is false? a. Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. b. Menstruation occurs just after LH and FSH levels peak. c. Menstruation occurs after progesterone levels drop. d. Estrogen levels rise before ovulation, while progesterone levels rise after.arrow_forwardIn positive mechanism, which of the following will happen if there is an increase production of estrogen in day 12 to 14 of the menstrual cycle? a/The level of released hormones cannot be determined b.There is a decrease release of estrogen in the ovaries c.There is an increase release of estrogen in the ovaries d.There is constant level of estrogen in the ovariearrow_forwardOne of the roles of follicle-stimulating hormones(FSH) in the female reproductive system is Select one: A. To trigger the thickening of the endometrium in the luteal stage B. To promote menstruation during the follicular stage C. To promote menstruation during the luteal stage D. To trigger the thickening of the endometrium in the follicular stagearrow_forward
- The testicles of male mammals are suspended in the scrotum because a. the optimum temperature for sperm production is less than the normal core body temperature of the organism. b. the optimum temperature for sperm production is higher than the normal core body temperature of the organism. c. there is not enough room in the pelvic area for the testicles to be housed internally. d. it is easier for the body to expel sperm during ejaculation.arrow_forwardOestrogens are produced from androgens in the granulosa cells (GC) in the ovary. These androgens are derived from… a) The blood b) The interstitial (theca) cells c) Granulosa cells d) The oocytearrow_forwardWhich of the following event is true regarding the menstrual phase? A. The stratum basalis is sloughed off B. It marks the end of each reproductive cycle C. It is due to high levels of estrogen and progesterone D. It starts a new reproductive cycle E. All of the abovearrow_forward
- According to the diagram at right, FSH injections to super-stimulate the ovaries will: a. Rescue the subordinate follicles from atresia b. Reverse atresia of subordinate follicles c. Stimulate new waves of follicular growth d. Cause ovulation of atretic follicles what prevents the dominant follicles of Waves 1 and 2 from ovulating? a. follicles are not big enough b. the animal is not in heat c. the high progesterone prevents the LH/FSH surge d. all of the above e. none of the abovearrow_forwardWhich of the following causes bleeding (menstruation) during the menstrual cycle? a) Reduced release of progesterone from the ovaries b) Increased release of progesterone leading to blood clots c) Increased release of estrogen (estradiol) from the ovaries that simulates the uterine muscles to contract d) Reduced release of oxytocin which causes the uterine muscles to relaxarrow_forwardWhich of the following statements correctly describes the function of the Sertoli cells? a. Stimulate spermatogenesis b. Support the developing sperm cells c. Control the overproduction of testosterone d. Store testosterone in the testesarrow_forward
- Which of the following statements does NOT describe the role of progesterone in the female reproductive system? a. Triggers the release of the ovum b. Prevents smooth muscle contraction, thereby preventing premature birth c. Prevents the shedding of the endometrium d. Ensures that the endometrium is thick enough to support a fetilized eggarrow_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_forwardWhich of the following situation leads to decreased fertility? Select one: A. Hepatitis B Infection B. Regular monthly menstrual cycles C. Exercising regularly and eating healthy D.Normal sperm countarrow_forward
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