Embryology

26. Which of the following correctly lists the stages of early embryogenesis in the proper order from fertilization to implantation?

1

שאלה #182880

		Zygote → Compaction → Cleavage → Blastocyst → Hatching → Implantation
		Cleavage → Zygote → Compaction → Blastocyst → Hatching → Implantation
		Zygote → Cleavage → Compaction → Blastocyst → Hatching → Implantation
		Zygote → Cleavage → Blastocyst → Compaction → Hatching → Implantation

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27. Which extra-embryonic tissues are involved in fetal blood circulation?

1

שאלה #182885

		A. Amnion
		B. Chorion
		C. Allantois
		D. Yolksac
		E. All of the above
		F. B+D
		G. B+C+D

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28. Which extra-embryonic tissue developed as an adaptation to dry environment in evolution?

1

שאלה #182886

		Amnion
		Chorion
		Allantois
		Yolksac
		All of the above

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29. Which trophoblast cells make up the placenta?

1

שאלה #182888

		Cytotrophoblasts
		Syncytiotrophoblasts
		Both

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30. Which layers make up the bilaminar disc (e.g., human embryos)?

1

שאלה #182890

		A. The amnion
		B. The chorion
		C. The hypoblast
		D. The epiblast
		E. A+B
		F. C+D

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31. Which of the following is NOT true about gastrulation?

1

שאלה #182892

		C. Gastrulation is unique to vertebrates
		B. Involves the formation of the epiblast and hypoblast
		D. Involves the formation of the endoderm, ectoderm and mesoderm
		A. Is a stage of rapid cell type diversification
		E. A+D
		F. B+C

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32. Which organ/structure is most associated with gastrulation?

1

שאלה #182893

		The epiblast
		The node
		The hypoblast
		The primitive streak

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33. Which sentence best describes the difference between the node and the primitive streak?

1

שאלה #182894

		The node is an organizing center responsible for left-right asymmetry and patterning of the embryo. The primitive streak is a zone in the epiblast through which cells migrate to form mesoderm or endoderm
		The primitive streak is an organizing center responsible for left-right asymmetry and patterning of the embryo. The node is a zone in the epiblast through which cells migrate to form mesoderm and endoderm
		The node is unique to amphibians, where it is known as the organizer. The primitive streak is a zone in the epiblast through which cells migrate to form mesoderm and endoderm
		The node is unique to amphibians, where it is known as the organizer. The primitive streak is an organizing center responsible for left-right asymmetry and patterning of the embryo

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34. Migration of cells out of the primitive streak requires:

1

שאלה #182896

		A. Loss of integrin adhesion to extracellular matrix (ECM)
		B. Loss of cadherin-mediated adhesion between cells in the streak
		C. Repression of E-cadherin expression by the transcription factor SNAIL/SNAI1
		D. Repression of Integrin B1 expression by the transcription factor SNAIL/SNAI1
		E. A+D
		F. B+C

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37. What is correct about anterior-posterior axis formation in embryos?

1

שאלה #182898

		A. The process is identical in all embryos
		B. The axis is already determined in the unfertilized oocyte of some embryos
		C. There is no indication of an axis in mouse blastocysts
		D. In mice, the first indication of axis formation is migration of mesoderm to the anterior pole
		E. A+D
		F. B+C
		G. C+D

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Discuss, Learn and be Happy דיון בשאלות

26. Which of the following correctly lists the stages of early embryogenesis in the proper order from fertilization to implantation?

27. Which extra-embryonic tissues are involved in fetal blood circulation?

28. Which extra-embryonic tissue developed as an adaptation to dry environment in evolution?

29. Which trophoblast cells make up the placenta?

30. Which layers make up the bilaminar disc (e.g., human embryos)?

31. Which of the following is NOT true about gastrulation?

32. Which organ/structure is most associated with gastrulation?

33. Which sentence best describes the difference between the node and the primitive streak?

34. Migration of cells out of the primitive streak requires:

37. What is correct about anterior-posterior axis formation in embryos?

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