ANATOMY & PHYSIOLOGY: AN INTEGRATIVE APP
3rd Edition
ISBN: 9781266163654
Author: McKinley
Publisher: MCG
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Textbook Question
Chapter 29, Problem 1DYB
_____ 1. The outer layer of the blastocyst that attaches to the wall of the uterus at implantation is called the
- a. amnion.
- b. yolk sac.
- c. cembryoblast.
- d. trophoblast.
Expert Solution & Answer
Summary Introduction
Introduction:
Fertilization is defined as the process by which male and female gametes are the fuse to form a zygote and it is further developed into an embryo. The zygote form contains a diploid number of chromosomes.
Answer to Problem 1DYB
Correct answer:
Trophoblast is the outer layer of the blastocyst which is attached to the wall of the uterus at implantation. Therefore, option d. is correct.
Explanation of Solution
Reason for the correct statement:
Option d. is given as “trophoblast”. Trophoblast is an outer layer of cells that surrounds the fluid-filled cavity. These cells will form chorion. It plays an important role in implantation of the embryo and also in the formation of the placenta.
Hence, option d. is correct.
Reasons for the incorrect statements:
Option a. is given as “amnion”. It is an extraembryonic membrane formed from epiblast layer. It is a thin membrane. Hence, option a. is incorrect
Option b. is given as “yolk sac”. It is the first extraembryonic membrane and is formed from hypoblast layer. Hence, option b. is incorrect.
Option c. is given as “embryoblast”. It is the inner mass of the blastocyst. Hence, option c. is incorrect.
Hence, options a., b., and c. are incorrect.
Conclusion
Trophoblast is the outer layer of the blastocyst which is involved in embryo implantation.
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Chapter 29 Solutions
ANATOMY & PHYSIOLOGY: AN INTEGRATIVE APP
Ch. 29.1 - Prob. 1LOCh. 29.1 - What distinguishes the pre-embryonic period from...Ch. 29.2 - Prob. 2LOCh. 29.2 - Prob. 3LOCh. 29.2 - Prob. 1WDTCh. 29.2 - Prob. 2WDLCh. 29.2 - Prob. 3WDLCh. 29.2 - Prob. 4LOCh. 29.2 - Prob. 5LOCh. 29.2 - How many cells are present initially in the...
Ch. 29.2 - Prob. 5WDLCh. 29.2 - Prob. 6LOCh. 29.2 - Prob. 7LOCh. 29.2 - Prob. 6WDLCh. 29.2 - Prob. 7WDLCh. 29.2 - Prob. 8LOCh. 29.2 - Prob. 9LOCh. 29.2 - What are the two cell layers of the bilaminar...Ch. 29.2 - Which cell layers give rise to each of the three...Ch. 29.2 - Prob. 10LOCh. 29.2 - Prob. 11LOCh. 29.2 - Prob. 10WDLCh. 29.3 - Prob. 12LOCh. 29.3 - Prob. 13LOCh. 29.3 - Prob. 11WDLCh. 29.3 - Prob. 14LOCh. 29.3 - Prob. 15LOCh. 29.3 - Prob. 12WDLCh. 29.3 - Prob. 13WDLCh. 29.3 - LEARNING OBJECTIVE
16. Define organogenesis and...Ch. 29.3 - Why is it important for a pregnant woman to...Ch. 29.4 - LEARNING OBJECTIVE
17. Describe the major events...Ch. 29.4 - Prob. 15WDLCh. 29.5 - LEARNING OBJECTIVE
18. Compare and contrast the...Ch. 29.5 - WHAT DID YOU LEARN?
16 What are some of the...Ch. 29.5 - LEARNING OBJECTIVE
19. Discuss the critical...Ch. 29.5 - Prob. 20LOCh. 29.5 - How do estrogen and progesterone act to sustain...Ch. 29.5 - What are the actions of CRH, HPL, oxytocin, and...Ch. 29.5 - Prob. 21LOCh. 29.5 - Prob. 22LOCh. 29.5 - Prob. 2WDTCh. 29.5 - Prob. 19WDLCh. 29.5 - Prob. 20WDLCh. 29.5 - Prob. 23LOCh. 29.5 - Prob. 24LOCh. 29.5 - Prob. 21WDLCh. 29.5 - Prob. 22WDLCh. 29.5 - Prob. 25LOCh. 29.5 - Prob. 26LOCh. 29.5 - Prob. 23WDLCh. 29.5 - Prob. 24WDLCh. 29.5 - Prob. 27LOCh. 29.5 - Prob. 25WDLCh. 29.6 - LEARNING OBJECTIVE
28. Explain the physiologic...Ch. 29.6 - How do progesterone, estrogen, and oxytocin...Ch. 29.6 - LEARNING OBJECTIVE
29. List the signs and...Ch. 29.6 - Prob. 27WDLCh. 29.6 - LEARNING OBJECTIVE
30. Explain the signs and...Ch. 29.6 - LEARNING OBJECTIVE
31. Describe the positive...Ch. 29.6 - Prob. 28WDLCh. 29.6 - Prob. 29WDLCh. 29.6 - Prob. 32LOCh. 29.6 - Prob. 30WDLCh. 29.6 - Prob. 31WDLCh. 29.7 - Prob. 33LOCh. 29.7 - Prob. 34LOCh. 29.7 - Prob. 3WDTCh. 29.7 - Prob. 32WDLCh. 29.7 - Prob. 33WDLCh. 29.8 - Prob. 35LOCh. 29.8 - Prob. 34WDLCh. 29.8 - Prob. 36LOCh. 29.8 - Prob. 35WDLCh. 29.8 - Prob. 37LOCh. 29.8 - Prob. 4WDTCh. 29.8 - How does the positive feedback mechanism in...Ch. 29.8 - Prob. 38LOCh. 29.8 - Prob. 37WDLCh. 29.9 - Prob. 38WDLCh. 29.9 - Prob. 40LOCh. 29.9 - How does codominant inheritance differ from...Ch. 29.9 - Prob. 41LOCh. 29.9 - Prob. 40WDLCh. 29.9 - Prob. 42LOCh. 29.9 - Prob. 41WDLCh. 29 - _____ 1. The outer layer of the blastocyst that...Ch. 29 - _____ 2. At about day 3 after fertilization, the...Ch. 29 - During gastrulation, cells from the _____ layer of...Ch. 29 - ______ 4. The cells of the embryoblast...Ch. 29 - _____ 5. Which of the following is not an...Ch. 29 - _____ 6. All of the following cardiovascular...Ch. 29 - _____ 7. After a woman gives birth, what happens...Ch. 29 - _____ 8. Freckles are considered to be a dominant...Ch. 29 - _____ 9. Skin color is a trait that is determined...Ch. 29 - A woman is a carrier for the color-blindness gene,...Ch. 29 - Briefly describe the process of fertilization,...Ch. 29 - List the five regions of the mesoderm, and...Ch. 29 - Explain why teratogens are especially harmful to...Ch. 29 - Describe the differences between the embryonic...Ch. 29 - Prob. 15DYBCh. 29 - Prob. 16DYBCh. 29 - Prob. 17DYBCh. 29 - Describe the various ways by which the mothers...Ch. 29 - Compare and contrast strict dominant-recessive...Ch. 29 - Explain the difference between X-linked recessive...Ch. 29 - Prob. 1CALCh. 29 - Ashley is a 29-year-old pregnant woman who is in...Ch. 29 - Ashley is a 29-year-old pregnant woman who is in...Ch. 29 - Prob. 4CALCh. 29 - Ashley is a 29-year-old pregnant woman who is in...Ch. 29 - Prob. 1CSLCh. 29 - Prob. 2CSLCh. 29 - Prob. 3CSL
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- Nutrient and waste requirements for the developing fetus are handled during the first few weeks by _____. a. the placenta b. diffusion through the endometrium c. the chorion d. the blastocystarrow_forwardAll 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 uterusarrow_forwardWhich of the following occurs during a capacition A. Regeneration of placenta B. Involution of the uterus C. Release of digestive enzymes from the acrosome D. Decreased use of simple sugars for energy productionarrow_forward
- During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum? Select one: a. The corpus luteum produces relaxin, which thickens the endometrium. b. The corpus luteum ensures that the endometrium does not break down during the first trimester. c. The corpus luteum supports the formation of the placenta. d. The chorion forms the fetal part of the placenta, and the corpus luteum supports the maternal part of the placenta.arrow_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_forwardWhich of the following rows identifies structures responsible for maintaining the endometrium before and immediately after implantation? Select one: A. Before Implantation After Implantation Corpus Luteum Placenta B. Before Implantation After Implantation Maturing Follicle Placenta C. Before Implantation After Implantation Corpus Luteum Trophoblast D. Before Implantation After Implantation Maturing Follicle Trophoblastarrow_forward
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- A woman has been diagnosed with a ruptured ectopic pregnancy. Which of the following signs/symptoms is characteristic of this diagnosis? A. Dark brown rectal bleeding. B. Severe nausea and vomiting. C. Sudden lower quadrant pain earlier in the pregnancy. D. Marked hyperthermia.arrow_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 capillaries 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…arrow_forwardasaparrow_forward
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