Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
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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During human gestation, rudiments of all organs develop (A) in the first trimester. (B) in the second trimester. (C) in the third trimester. (D) during the blastocyst stage.
At what stage of embryonic development does implantation occur? a) Before fertilisation b) At the blastocyst stage c) After cell division has occurred d) At the end of the first trimester e) During the 8 cell stage
Into which structures do the trophoblast cells of the developing embryo, differentiate? a) The developing foetus b) The yolk sac c) The placenta d) The blood vessels e) All of the above
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 - For which is the number the same in males and...Ch. 36 - Prob. 7TYUCh. 36 - Prob. 8TYUCh. 36 - FOCUS ON EVOLUTION Hermaphroditism is more often...Ch. 36 - Prob. 10TYUCh. 36 - Prob. 11TYU
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- A human blastocyst normally implants in ................. a. an oviduct c. the uterus b. a seminiferous tubule d. the vaginaarrow_forward1. During the embryonic period, the lungs first appear at about the A. 10th day after fertilization B. 24th day after fertilization C. 6th week after fertilization D. 12th week after fertilizationarrow_forwardThe birth starts thanks to increased ... a) ... stretching of the uterine muscles. b) ... release of oxytocin. c) ... release of glucocorticoids from the fetus. d) ... release of estrogen from the placenta.arrow_forward
- During the embryonic developmen, the trophoblast will developed into Select one: A. The embryonic disc B. The chorion C. The amnion and amniotic cavity D. The yolk sacarrow_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_forwardPlacenta is the structure formed: A. by the union of foetal and uterine tissue B. by foetus only C. by fusion of germ layers D. None of thesearrow_forward
- The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the placenta.c. gives rise to the embryo.d. consists of highly differentiated cells.arrow_forwardWhich of the following statements is NOT correct about the umbilical cord? a. The umbilical cord is formed from the yolk sac and the allantois. b. The umbilical cord is formed from the chorion. c. The umbilical cord consists of two arteries and one vein. d. The placenta connects to the embryon via the umbilical cord.arrow_forwardWhat would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? a. The cells would not continue to divide. b. The corpus luteum would continue to produce progesterone and estrogen. c. Menses would flush the blastocyst out of the uterus. d. The uterine mucosa would not envelop the blastocyst.arrow_forward
- Which of the following is required for successful fetal development after the egg has been fertilized? a) That the corpus luteum remains throughout the pregnancy b) Production of estrogen (estradiol) and progesterone from the placenta c) Release of hCG (human chorionic gonatotropin) from the placentaarrow_forwardThe folding of ectoderm on the top of the embryo during organogenesis produces...? Group of answer choices a. somites b. the archenteron c. the neural tube d. the gastrula e. the blastulaarrow_forwardAt what stage uteroplacental circulation started? a.Maternal blood entering the lacunar b.Embryo completely embedded c.Formation of extraembryonic mesoderm d.Formation of lacunararrow_forward
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