Which of the following is correct?
A) The inner cell mass differentiates into three germ layers.
B) In the 8 weeks between conception and the end of the embryonic period, the zygote changes from a fertilized egg to a remarkably complex organism consisting of millions of differentiated cells.
C) The mass of cells surrounding the zygote develop by the end of the embryonic period into the amniotic sac, placenta, and umbilical cord.
D) All of the alternatives are accurate.
Correct Answer:
Verified
Q16: All major internal and external structures form
Q17: The endodermal layer eventually forms
A) the nervous
Q18: The ectodermal cells develop into
A) the heart.
B)
Q19: The mesodermal layer eventually gives rise to
Q20: By the end of the third week,
Q22: By the end of the eighth week
Q23: The prenatal support system-the amniotic sac, placenta,
Q24: The embryo grows within the _, a
Q25: One function of the amniotic sac is
Q26: The exchange of materials between the fetus
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