Answered: . A placenta vera is formed if a.The…

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter28: Development And Inheritance

Section: Chapter Questions

Problem 12RQ: What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Tire...

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1. 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 division.

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