Campbell Biology In Focus
2nd Edition
ISBN: 9780134203072
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 36, Problem 6TYU
Which of the following statements is true?
- A. All mammals have menstrual cycles.
- B. The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.
- C. Estrous cycles are more frequent than menstrual cycles.
- D. Ovulation occurs before the endometrium thickens in estrous cycles.
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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.
Which of the following statement does NOT describe the event that occurs if the ovum is not fertilized?
Select one:
A. Progesterone maintains the endometrium for the zygote.
B. Low level of progesterone results in menstruation.
C. The corpus luteum degenerates and stops producing estrogen and progesterone.
D. GnRH, FSH, and LH levels begin to increase.
Which of the following statements does NOT describe the events that occur if the ovum is not fertilized?
Select one:
a. The corpus luteum degenerates and stops producing estrogen and progesterone.
b. GnRH, FSH, and LH levels begin to increase.
c. Progesterone maintains the endometrium for the zygote.
d. Low levels of progesterone result in menstruation.
Chapter 36 Solutions
Campbell Biology In Focus
Ch. 36.1 - Prob. 1CCCh. 36.1 - Prob. 2CCCh. 36.1 - MAKE CONNECTIONS What examples of plant...Ch. 36.2 - Prob. 1CCCh. 36.2 - Why might using a hot tub frequently make it...Ch. 36.2 - Prob. 3CCCh. 36.2 - WHAT IF? If each vas deferens in a male was...Ch. 36.3 - Prob. 1CCCh. 36.3 - How does an estrous cycle differ from a menstrual...Ch. 36.3 - Prob. 3CC
Ch. 36.4 - Prob. 1CCCh. 36.4 - Prob. 2CCCh. 36.4 - Prob. 3CCCh. 36 - Prob. 1TYUCh. 36 - The cortical reaction of sea urchin eggs functions...Ch. 36 - Prob. 3TYUCh. 36 - Prob. 4TYUCh. 36 - Prob. 5TYUCh. 36 - Which of the following statements is true? A. All...Ch. 36 - For which is the number the same in males and...Ch. 36 - Prob. 8TYUCh. 36 - Prob. 9TYUCh. 36 - Prob. 10TYUCh. 36 - FOCUS ON EVOLUTION Hermaphroditism is more often...Ch. 36 - Prob. 12TYUCh. 36 - Prob. 13TYU
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- Which of the following statements about oocytes and ovulation is correct? a. The production of primary oocytes continues in women from the onset of puberty until the onset of menopause. b. Meiotic divisions are complete at the time of ovulation. c. At ovulation, the structure released from the follicle includes a secondary oocyte and polar body. d. All of these statements are correctarrow_forwardWhich of the following statements describes what occurs if the ovum is fertilized? Select one: a. GnRH, FSH, and LH levels begin to increase. b. The corpus luteum degenerates and stops producing estrogen and progesterone. c. Progesterone maintains the endometrium for the zygote. d. Low levels of progesterone result in menstruation.arrow_forwardWhich of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estradiol are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol.arrow_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_forwardA. There is an increase of FSH at the beginning of the menstrual cycle. What causes it? B. There is a surge in E2 level before the ovulation. What causes it? C. There is a decrease of FSH before the ovulation. What causes it? D. There is a surge of LH and FSH that induces the ovulation. What causes the surge? E. There is a decrease of LH and FSH after ovulation. What causes it? F. There is a decrease in E2 after ovulation. What causes it? G. There is an increase of E2 and P4 a few days after the ovulation. What causes it? H. There is a decrease of E3 and P4 at the end of menstrual cycle. What causes it?arrow_forwardWhich description below explains how the hormones released in birth control pills causes natural ovulation to cease? Select one: a. Birth control pills release estrogen. Estrogen controls the secondary sex characteristics of the female body. b. Birth control pills release progesterone. Progesterone feeds back to the pituitary gland, thereby inhibiting FSH and LH and in effect, stopping the ovarian and menstrual cycle. c. Birth control pills release progesterone. Progesterone causes an increase in FSH, thereby increasing the production of follicles. d. Birth control pills release estrogen. Estrogen feeds back to the posterior pituitary, causing an increase of LH and thereby ceasing the ovarian cycle.arrow_forward
- Which of the following is not a mechanism on how contraceptive pills work to prevent pregnancy? A. thinning the endometrium to prevent implantation B. inhibition of follicular development and suppression of ovulation C. progesterone inhibits the sperm from penetrating through the cervix and female upper tract by making the cervical mucus unfriendly D. stimulates the production of high testosterone levelsarrow_forwardIn a menstrual cycle that does not result in pregnancy,a. LH stimulates follicle development early in the cycle.b. GnRH stimulates follicle development late in the cycle.c. ovulation typically occurs a day or two beforemenstruation.d. negative feedback by estrogen and progesterone inhibitsthe secretion of GnRH.arrow_forwardHow do tubal ligations and vasectomies prevent further pregnancies? Select one: a. The corpus luteum and the epididymis are suppressed using a chemical swab. The fertilized egg could no longer implant in the endometrium. b. The Fallopian tubes and vas deferens are cut and tied off, thereby preventing the movement of the eggs and sperm. c. The Fallopian tubes and the vas deferens are cut. Eggs and sperm can no longer be produced. d. The Fallopian tube and vas deferens are cut and tied off, thereby reducing needed reproductive hormone levels.arrow_forward
- Which of the following statements is false? a. Cadherins, but not integrins play a role in gastrulation. b. Gastrulation creates the primary germ layers c. Gastrulation requires cells to change their gene expression. d. Body axes are stabilized (made permanent) during gastrulation.arrow_forwardWhat happens to the stratum functionalis of the endometrium during menstruation? Group of answer choices a.it gets larger and more energy-rich b.it develops into the myometrium c.it allows implantation of the embryo d.it is sloughed offarrow_forwardDuring the menstrual phase of the uterine cycle, a. estrogen and progesterone levels reach their highest concentrations. b. ovulation occurs. c. a pool of follicles begin to secrete estrogen. d. progesterone inhibits additional surges of luteinizing hormone.arrow_forward
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