Human Anatomy (8th Edition)
8th Edition
ISBN: 9780134243818
Author: Elaine N. Marieb, Patricia Brady Wilhelm, Jon B. Mallatt
Publisher: PEARSON
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Chapter 3, Problem 16RQ
Summary Introduction
To determine:
The characteristic features of the fetal period.
Introduction:
The fetal period includes the time of growth and maturation of the body. Most cells and tissue differentiation is concluded in the first half of the fetal period. At the beginning of the fetal period, the size of the fetus is approximately 30 millimeters in length. Before the initiation of the fetal period, the precursors required for all the major organs are formed.
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All 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 uterus
1. Embryonic development occurs during this period.
A. from the ninth week of gestation to birth
B. from fertilization to implantation
C. from implantation to the end of the eighth week of gestation
D. from conception to birth
2. Part of the gastrulation phase includes the formation of germ layers that will...
A. go on to form the placenta.
B. form the ectoderm, mesoderm, and endoderm that will become specific tissues and organs.
C. spread disease.
D. produce the amniotic fluid.
Which of the following is generated by the totipotent fertilized egg, but not by the pluripotent stem cells in the blastocyst?
O A. the liver
OB. the lung
OC. the brain
D. the umbilical cord
O E. the hairs on your skin
Chapter 3 Solutions
Human Anatomy (8th Edition)
Ch. 3 - Dining which prenatal period is the basic body...Ch. 3 - Which abdominal structures form from the inner...Ch. 3 - Using directional terms (Table 1.1), describe the...Ch. 3 - Describe gastrulation. During which week of...Ch. 3 - What structure induces the formation of the neural...Ch. 3 - Which type or types of mesoderm Cluster into...Ch. 3 - After folding takes place, which embryonic germ...Ch. 3 - Does endoderm form the inner Iining of the inner...Ch. 3 - Which part of the somite forms the vertebrae and...Ch. 3 - What does the splanchnic lateral plate mesoderm...
Ch. 3 - A birth defect in the heart is caused by a...Ch. 3 - Why is respiratory distress common in babies born...Ch. 3 - 1ndicate whether each of the following relates to...Ch. 3 - The outer layer of the blastocyst, which attaches...Ch. 3 - Most birth defects can be traced to disruption of...Ch. 3 - The primary germ layer that forms the trunk...Ch. 3 - Each embryonic structure in column B with its...Ch. 3 - Match each date in column B [approximate time...Ch. 3 - It is currently possible to save some premature...Ch. 3 - Somites are evidence of (a) a structure from...Ch. 3 - Which of the following embryonic structures are...Ch. 3 - Prob. 10RQCh. 3 - When it is 1.5 months old, an average embryo is...Ch. 3 - Gastrulation is the (a) formation of three germ...Ch. 3 - The epiblast forms (a) only the ectoderm, (b) the...Ch. 3 - The limbs develop during the (a) start of the...Ch. 3 - The notochord develops primarily from (a)...Ch. 3 - Prob. 16RQCh. 3 - What important event occurs at the primitive...Ch. 3 - What is the function of the amniotic sac and the...Ch. 3 - (a) What is mesenchyme? (b) How does it differ...Ch. 3 - Explain how the flat embryonic disc takes on the...Ch. 3 - In anatomy lab, Thaya pointed to the vertebrae of...Ch. 3 - Neural crest is the one embryonic tissue that is...Ch. 3 - Many embryonic events �rst occur cranially, then...Ch. 3 - Prob. 24RQCh. 3 - Differentiate the outer tube from the inner tube....Ch. 3 - Before Delta studied embryology in her anatomy...Ch. 3 - A friend in your dormitory, a freshman, tells you...Ch. 3 - Insufficient folic acid in the early weeks of...Ch. 3 - Your cat finds a large ball of string and starts...Ch. 3 - When is the earliest time the sex of a fetus can...
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- Which of the following consists of both fetal and maternal tissues? (a) umbilical cord (b) placenta (c) amnion (d) allantois (e) yolk sacarrow_forwardDuring which of the following would the focus of classes be mainly on physiologic changes, fetal development, sexuality, during pregnancy, and nutrition? * A. Prepregnant period B. First trimester C. Second trimester O D. Third trimester Oarrow_forwardGiven these structures:(1) blastocyst (2) morula (3) zygoteChoose the arrangement that lists the structures in the order in whichthey form during development.a. 1,2,3 c. 2,3,1 e. 3,2,1b. 1,3,2 d. 3,1,2arrow_forward
- 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.arrow_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_forward1. A placenta vera is formed if a.The placenta is removed during birth. b. The maternal blood bathes the chorionic villi. c. The epithelium of the decidua is not penetrated by the chorion. d. The binucleated chorionic cells penetrate the decidual epithelium. 2. Which of the following does NOT occur during decidualization? a. endometrial es dilate and form sinusoids b. syncytiotrophoblast extend further and form chorionic villi c. endometrial stromal cells accumulate glycogen and lipids d. syncytiotrophoblast is eroded and lacunae are filled with maternal blood 3. Which of the following reasons justifies the midblastula transition? a. The yolk at the vegetal pole slows down the cleavage divisions. b. The embryo has already completed the requirements for initial cleavage. c. The embryo needs to replenish transcripts after using its maternal reserves. d. The embryo needs to replenish its energy after several rounds of fast division.arrow_forward
- The major development of organ systems takes place ina. weeks 1 and 2 of development.b. weeks 3–8 of development.c. weeks 8–20 of development.d. the last 30 weeks of development.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_forwardThe feature that distinguishes a fetus from an embryo is that the fetus has a. All of the organ systems. b. Three germ layers. c. A placenta. d. An amnion. e. Arm and leg buds.arrow_forward
- The timing of puberty can be influenced by which of the following? a. genes b. stress c. amount of body fat d. all of the abovearrow_forwardThe cells of the embryoblast differentiate into the ______ andthe ______.a. epiblast, hypoblastb. cytotrophoblast, syncytiotrophoblastc. amnioblast, epiblastd. epiblast, cytotrophoblastarrow_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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