Campbell Essential Biology with Physiology (5th Edition)
5th Edition
ISBN: 9780321967671
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 26, Problem 8SQ
Summary Introduction
Concept introduction: During the period of gastrulation, three germ layers namely ectoderm, endoderm, and mesoderm are produced. The outer layer is the ectoderm, and the inner layer is the endoderm. Mesoderm is present in between the ectoderm and mesoderm.
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- Which 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_forwardAt which stage of embryogenesis, major patterns of the internal tissues of the embryo have been already established? A. Octant stage embryo B. Globular stage embryo O C. Heart-shaped stage embryo O D. Torpedo stage embryoarrow_forwardWhich of these embryonic germ layers gives rise to muscle, bone, andblood vessels?a. ectoderm b. endoderm c. mesodermarrow_forward
- Odontoblasts are derived from a. Ectoderm b. Endoderm c. Histiocytes d. Undifferentiated mesenchymal cellsarrow_forwardWhen does an embryo become a fetus? Select one: a. When gastrulation forms the three primary germ layers b. When neurulation forms the brain and the spinal cord c. As soon as the heart begins to beat d. When organ formation completesarrow_forwardWhich of the following structures develops into only the fetus? a. Inner cell mass b. Trophoblast c. Blastocyst d. Zygotearrow_forward
- Which of the following extra-embryonic membranes becomes the embryonic portion of the structure involved in waste and nutrient exchange between the embryo and the mother? Select one: a. Chorion b. Amnion c. Allantois d. Yolk Sacarrow_forwardWhich of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.arrow_forwardWhich of the following statements is NOT correct about the umbilical cord? Select one: a. The umbilical cord is formed from the chorion. b. The placenta connects to the embryon via the umbilical cord. c. The umbilical cord consists of two arteries and one vein. d. The umbilical cord is formed from the yolk sac and the allantois.arrow_forward
- During which stage of pregnancy will folate supplements lower the incidence of neural tube defects in infants? a. Last trimester of pregnancy b. Second trimester of pregnancy c. Second and third trimesters of pregnancy d. Month before conception through the first trimester of pregnancyarrow_forwardAt which stage of embryonic development does the embryo have a blastopore? Group of answer choices A.Blastula B. Zygote C. Morula D. Gastrulaarrow_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
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