20.What is derived from the endodermal germ layer?
2) The formation of the lining of the two tubes within the vertebrate body, the digestive tubeand the respiratory tube(both formed from the primitive gut).ORThe endoderm has two major functions during development.not what question is asking 21.Name three organs that develop as outgrowths of the early digestive system and name one function for each of these organs.The endoderm has two major functions during development. Not what question isasking 22.Amniote eggs have a variety of adaptations to development inside the mother’s body (or on land). For each of these adaptations state the germ layer origin(s) and the environmental problem it targets.
Four sets of extraembryonic membranes : Ectoderm and somatic (parietal) mesoderm (=somatopleure) form the amnion and chorion. Endoderm and splanchnic (visceral) mesoderm (=splanchnopleure) form the yolk sac and allantios Endoderm and ectoderm supply the epithelial cells and the mesoderm provides the blood supply. OR 1. Amnion - aqueous environment shouldn‟t this be dessication or dehydration? it 23.GENERAL QUESTION: Cells make multiple transitions during development between epithelial and mesenchymal states. There are also many examples of communication between epithelial and mesenchymal structures. Think about example(s) for eachof these two events, and about its role in development
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- Summer '14
- Developmental Biology, Blood vessel, Endothelium, Mesoderm