Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Textbook Question
Chapter 3, Problem 2RQ
The outer layer of the blastocyst, which attaches to the uterine wall, is the (a) yolk sac, (b) trophoblast, (c) amnion, (d) inner cell mass.
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The outer layer of the blastocyst, which attaches to the uterine wall, is the (a) yolk sac, (b) trophoblast, (c) amnion, (d) inner cell mass.
The surface that enables active and passive exchange between the fetal and maternal bloodstreams is the (a) yolk stalk. (b) chorionic villi. (c) umbilical veins. (d) umbilical arteries.
The epiblast forms (a) only the ectoderm, (b) the yolk sac, (c) only the mesoderm and ectoderm, (d) all three primary germ layers.
Chapter 3 Solutions
Human Anatomy
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 - The fetal period is (a) the �rst 8 weeks of...Ch. 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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- How does the placenta form, and what is its function?arrow_forwardWhich of the following events does not take place when a fetus is 17 to 20 weeks old? (a) fetal movements quicken, (b) testes descend to the scrotum, (c) silklike hair covers the skin, (d) sweat glands form.arrow_forwardDuring 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.arrow_forward
- Most birth defects can be traced to disruption of the developmental events during this part of the prenatal period: (a) first 2 weeks, (b) second half of month 1 and all of month 2, (c) month 3, (d) end of month 4, (e) months 8 and 9.arrow_forwardWhich 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_forwardInto 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 abovearrow_forward
- (a) Give two types of germ layer and what do they become (b)Briefly describe why it is important the blood supply of the mother is separated from the foetus.arrow_forwardThe zygote arrives in the uterine cavity as a, (a) morula. (c) lacuna. (b) trophoblast. (d) blastomere.arrow_forwardWhat do the inner and outer surfaces of the placenta consist of? a) amniotic tissue and corpus luteum b) chorion and uterine tissue c) amniotic tissue and blastocyst d) corpus luteum and chorionarrow_forward
- Which germ layer of a blastocyst gives rise to muscle and connective tissues?arrow_forwardAt 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 stagearrow_forwardIf an egg cell were treated with EDTA, a chemical that bindscalcium and magnesium ions,(A) the acrosomal reaction would be blocked.(B) the fusion of sperm and egg nuclei would be blocked.(C) the fast block to polyspermy would not occur.(D) the fertilization envelope would not form.arrow_forward
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