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1. Which of the following statements regarding gastrulation is NOT true? A The epiblast becomes the...

1. Which of the following statements regarding gastrulation is NOT true?

A The epiblast becomes the ectoderm.

B The mesoderm is formed by migration of hypoblast cells.

C The endoderm faces the yolk sac.

D Gastrulation is a process that rearranges two layers into three layers.

2. Which of the following statements regarding implantation is NOT true?

A Uterine glands provide nutrients to the blastocyst via diffusion.

B The epiblast layer faces the amniotic cavity.

C The amniotic cavity appears when the inner cell mass separates from trophoblast.

D The cellular trophoblast is multinucleated.

3. Which of the following statements regarding the placenta is NOT true?

A The intervillous spaces are filled with maternal blood.

B The placenta becomes functional during the third month.

C The chorionic villi contain fetal blood vessels.

D The umbilical arteries carry oxygenated blood to the fetus.

Science   Anatomy-And-Physiology   
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Answer #1

1.B The mesoderm is formed by migration of hypoblast cells.

Explanation -Mesoderm is formed by the migration of epiblast cells and others options are true.

2.D The cellular trophoblast is multinucleated.

Explanation - multinucleated trophoblast is present in decidua of placenta but cellular traophoblast is not multinucleate.

3.C The chorionic villi contain fetal blood vessels.

Explanation-The chronic villi contains materal featl blood vessels and other options are correct.

  

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