1- Early in the third week, the endodermal sheet constitutes the
a membrane that separates the future mouth
hindgut
foregut
roof of the yolk sack

2- Delination of the yolk sac and gut beguins with the
ventral bending of the embryonic body
ventral bending of the cranial and caudal ends of the embryo
formation of the foregut
formation of the hindgut

3- As deliniation of the gut proceeds, the anterior end of the foregut remains temporarily sealed by
an ectodermal layer
an endodermal layer
the oropharyngeal membrane
a mesodermal bilayer

4- As the gut becomes increasingly tubular
there is induction of heart tissue by the digestive track epithelium
surrounding mesenchyme induces formation of endocrine glands and kidneys
the digestive track epithelium and surrounding mesenchyme induce each other
the respiratory system is formed from the yolk sac

5- Temporarily separates the ectodermaly-derived mouth from the endodermally derived pharinx
oropharyngeal membrane
foregut
ectodermal monolayer
yolk sac

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Answers:

1- Early in the third week, the endodermal sheet constitutes the
Answer: roof of the yolk sack

2- Delination of the yolk sac and gut beguins with the
Answer: ventral bending of the cranial and caudal ends of the embryo

3- As deliniation of the gut proceeds, the anterior end of the foregut remains temporarily sealed by
Answer: the oropharyngeal membrane

4- As the gut becomes increasingly tubular
Answer: the digestive track epithelium and surrounding mesenchyme induce each other

5- Temporarily separates the ectodermaly-derived mouth from the endodermally derived pharinx
Answer: oropharyngeal membrane