EBK CAMPBELL BIOLOGY IN FOCUS
2nd Edition
ISBN: 8220101459299
Author: Reece
Publisher: PEARSON
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Chapter 36, Problem 5TYU
Summary Introduction
Introduction:
In humans, gestation (pregnancy) lasts about nine months or forty weeks. This time period is divided into three trimesters each three months long.
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After fertilization, the successful development of a mature, full-termfetus depends ona. the release of human chorionic gonadotropin (hCG) by the developing placenta.b. the production of estrogen and progesterone by the placental tissues.c. maintenance of the corpus luteum for all 9 months.d. Both a and b are correct.e. All of these are correct.
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The outer layer of the blastocyst that attaches to the wall of the uterus at implantation is called the a. amnion. b. yolk sac. c. cembryoblast. d. trophoblast.
Chapter 36 Solutions
EBK 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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- Define and describe the main features of the following developmental stages: fertilization, cleavage, gastrulation.arrow_forwardLabel the early development stages shown in the following diagram.arrow_forwardFor the first 8 weeks of gestation, a conceptus is nourished mainly by a. The placenta. b. Amniotic fluid. c. Colostrum. d. Decidual cells. e. Yolk cytoplasmarrow_forward
- Which of the following statements does NOT correctly describe the events following fertilization? Select one: a. Only the inner cell mass cells in a blastocyst are pluripotent. b. The trophoblast has an important role in maintaining the pregnancy, as it prevents the endometrium from shedding. c. As hCG takes over maintaining the endometrium immediately after implantation, the corpus luteum degenerates into the corpus albican. d. All 16 cells in a morula are truly totipotent, meaning that they can become any cells in the human body.arrow_forwardThe outer layer of the blastocyst that attaches to the wall of theuterus at implantation is called thea. amnion.b. yolk sac.c. embryoblast.d. trophoblast.arrow_forwardAll of the following changes take place during the last trimester of pregnancy EXCEPT- a, the cerebral cortex develops b. the baby reaches the age of viability c. the fetus gains weight d. the blastocyst implants to the lining of the uterusarrow_forward
- During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum? Select one: a. The corpus luteum produces relaxin, which thickens the endometrium. b. The corpus luteum ensures that the endometrium does not break down during the first trimester. c. The corpus luteum supports the formation of the placenta. d. The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.arrow_forwardWhich of the following is NOT associated with the embryo developing into a male: a. androgen c. Müllerian ducts b. Wolffian ducts d. testosteronearrow_forwardThe seven-day blastocyst: A. has a single layer of trophoblast at the embryonic pole B. has an amniotic cavity C. is attached to the endometrial epithelium D. is surrounded by a degenerating zona pellucida E. is called the hypoblastarrow_forward
- All of the following events occur by the end of the eighth week of gestation EXCEPT Select one: a. the limb buds form distinct fingers and toes, and the face can be seen b. the heart begins to pump, and red blood cells are formed in the liver c. the reproductive structures have formed, and the gender of the baby can be determined through ultrasound d. lungs and kidneys have formedarrow_forwardWhat controls whether an embryo will develop testes or ovaries?a. pituitary glandb. hypothalamusc. Y chromosomed. presence or absence of estrogenarrow_forwardWhen pregnancy occurs, the endometrium is maintained bya. the embryo releasing hCG.b. a decrease in levels of progesterone.c. the hypothalamus releasing GnRH.d. increasing levels of FSHarrow_forward
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