Modified Masteringbiology With Pearson Etext -- Standalone Access Card -- For Human Biology Format: Access Card Package
8th Edition
ISBN: 9780134326412
Author: Johnson, Michael D.
Publisher: Prentice Hall
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Chapter 21, Problem 5TY
Summary Introduction
Introduction:
The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.
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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 stage
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 veins
Which 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.
Chapter 21 Solutions
Modified Masteringbiology With Pearson Etext -- Standalone Access Card -- For Human Biology Format: Access Card Package
Ch. 21 - Prob. 1QCCh. 21 - Prob. 2QCCh. 21 -
1. Why does only one sperm fertilize the egg, and...Ch. 21 - Prob. 2CRCh. 21 - Prob. 3CRCh. 21 - Describe the stages of labor and delivery.Ch. 21 - What causes the newborn to take its first breath...Ch. 21 - Prob. 6CRCh. 21 - What causes the onset of puberty (sexual...Ch. 21 - Summarize the three main hypotheses of the causes...
Ch. 21 - Prob. 9CRCh. 21 - Prob. 10CRCh. 21 - Which of the following lists the correct order of...Ch. 21 - Which of the following will result in fraternal...Ch. 21 -
3. Which of the following processes is the first...Ch. 21 - Prob. 4TYCh. 21 - Prob. 5TYCh. 21 - Prob. 6TYCh. 21 -
7. Which of the following is mismatched?
a....Ch. 21 - Prob. 8TYCh. 21 - Prob. 9TYCh. 21 -
10. Which of the following would be detrimental...Ch. 21 - Prob. 11TYCh. 21 - Prob. 12TYCh. 21 - Prob. 13TYCh. 21 - Prob. 14TYCh. 21 - Which hormone plays a critical role both in...Ch. 21 - Prob. 1AWKCh. 21 - Prob. 2AWKCh. 21 - Prob. 3AWKCh. 21 - Each year, it is estimated that over 40,000...Ch. 21 - Prob. 5AWKCh. 21 - Prob. 6AWKCh. 21 - How is it possible that one's life could be...
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- ___________ removes webs between developing digits. a. Gastrulation c. Apoptosis b. Lactation d. Implantationarrow_forwardAt which embryonic event would one be able to first distinguish whether an embryo is diploblastic or triploblastic? A)cleavage B)metamorphosis C)fertilization D)gastrulation E)organogenesisarrow_forwardEndoderm, Mesoderm, and Ectoderm are formed during ________. a. Gametogenesis b. Cleavage c. Gastrulation d. Organogenesisarrow_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_forwardThe process forming the neural tube and plate via the intercalation of cells along the medial-lateral axis and extension along the anterior-posterior axis occurs is called? a. neurulation b. embryogenesis c. convergent extension d. morphogenesisarrow_forwardWhich of the following extra-embyonic membranes become the embryonic portion of the structure involved in waste and nutrient exchange between the embryo and the mother? Select one: A. Amnion B. york sac C. Chorion D. Allantoisarrow_forward
- At which of the following stages of development is a frog embryo composed of the most cells? Group of answer choices A. blastula B. neural tube stage C. gastrula D. zygote (fertilized egg)arrow_forwardThe beginning of brain and spinal cord formation is termeda. cephalocaudal folding.b. organogenesis.c. neurulation.d. gastrulation.arrow_forwardThe 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_forward
- Internal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizersarrow_forwardA gastrulation does NOT Select one: A. Consist of endoderm, mesoderm, and ectoderm B. Result in the formation of a third layer in the embryonic disc C. Involve the formnation of germ layers D. Include the differentiation of cells into tissues and organsarrow_forwardWhich of the following statements is not true about the placenta? A. It provides exchange of wastes and nutrients between the mother and the fetus. B. It develops by the third month of gestation. C. It allows transfer of maternal immunoglobulin D. It allows passage of bacteria and virus. -Provide explanationarrow_forward
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