Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 17, Problem 8SQ
Summary Introduction
Introduction: By the eighth day of fertilization, the cells of embryoblast begin to differentiate into two layers called hypoblast and epiblast. Hypoblast layer is a layer of small cuboidal cells formed adjacent to the blastocyst cavity. Epiblast layer is a layer of columnar cells formed near the amniotic cavity. Both hypoblast and epiblast layers together form a flat disc like structure that is termed as bilaminar germinal disc.
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The cells of the embryoblast differentiate into the ______ andthe ______.a. epiblast, hypoblastb. cytotrophoblast, syncytiotrophoblastc. amnioblast, epiblastd. epiblast, cytotrophoblast
During gastrulation, cells from the _____ layer of the bilaminar germinal disc migrate and form the three primary germ layers. a. notochord b. hypoblast c. epiblast d. mesoblast
Which of the following structure develops into only the fetus?
A. Blastocyte
B. Zygote
C. Trophoblast
D. Inner cell mass
Chapter 17 Solutions
Human Biology Custom Edition
Ch. 17 - Define and describe the main features of the...Ch. 17 - Prob. 2RQCh. 17 - Summarize the development of an embryo and a...Ch. 17 - Label the early development stages shown in the...Ch. 17 - Prob. 1SQCh. 17 - During cleavage, the _______ is converted to a...Ch. 17 - Prob. 3SQCh. 17 - Prob. 4SQCh. 17 - _________ is the gene-guided process by which...Ch. 17 - In a human zygote, the cell divisions of cleavage...
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- Blood islands first form in the embryonic:- a. spleen. d. liver. b. yolk sac. e. red bone marrow. c. placentaarrow_forwardEctodermal cells of the developing embryo give rise to_____________ . a. bone tissue b. the kidneys c. the lining of the urethra d. the epidermisarrow_forwardMatch the germ layer on the right with its contribution to the tissues and organs of the embryo, on the left. v connective tissue stroma A. mesoderm v parenchymal cells, e.g., liver B. ectoderm C. mesoderm D. mesoderm E. endoderm F. endoderm vasculature v innervation v epithelium of enteric secretory duct tubes v epithelium of integumentary system G. ectoderm v elastic membranearrow_forward
- Blood islands are ________.a. clusters of blood-filtering cells in the placentab. masses of pluripotent stem cells scatteredthroughout the fetal bone marrowc. vascular tubes that give rise to the embryonictubular heart d. masses of developing blood vessels and formedelements scattered throughout the embryonic discarrow_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_forwardWhich of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veinsarrow_forward
- During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________. a. the blastula stage b. the germ layer stage c. the gastrula stage d. the organogenesis stagearrow_forwardAn egg cell originally comes from an unspecialized diploid cell called a(an)… Group of answer choices A. secondary oocyte B. follicle C. primary oocyte D. oviduct E. oogoniumarrow_forwardThe _______ is an important structure for waste storage in birds and some mammals, but not in humans.A. allantoisB. yolk sacC. placentaD. umbilical cordE. amnionarrow_forward
- During the embryonic development, the trophoblast will develop into Select one: a. the yolk sac b. the amnion and amniotic cavity c. the chorion d. the embryonic discarrow_forwardFetal urine accumulates in the and contributes to the fluid there. a. placental sinus b.yolk sac C. allantois d. chorion e. amnionarrow_forwardDuring the first 48-72 hours after birth, the breasts produce ________, a substance rich in protein and immunoglobulins which helps the baby adjust to a non-sterile environment. Group of answer choices a.endolymph b.colostrum c.meconium d.amniotic fluidarrow_forward
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