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A: The yolk sac is connected to the embryonic _____ by way of the vitelline duct.
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A: Answer is a.) it is unique to amphibian embryos.
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A: Answer (e). Defensive cells
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A: Answer is b.) amnion.
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- When the embryo is implanted, what developmental stage this be? cleavage fetus blastula gastrulaDuring what process does the amnion envelop theembryo?a. embryonic foldingb. gastrulationc. implantationd. organogenesisWhich of these becomes the gastrointestinal tract? mesoderm endoderm ectoderm all of the above none of the above
- Storage of milk is found within the of the breast . Montgomery's tubercles Lactiferous ducts Myoepithelium AlveoliThe placenta is formed from ________.a. the embryo’s mesenchymal cellsb. the mother’s endometrium onlyc. the mother’s endometrium and the embryo’schorionic membraned. the mother’s endometrium and the embryo’sumbilical cordIn humans, implantation in the uterus occurs at whichstage of embryonic development?a. zygoteb. morulac. blastocystd. gastrulation
- The anterior pituitary gland develops from whichembryonic germ layer?a. oral ectodermb. neural ectodermc. mesodermd. endodermThe brain and spinal cord develop from a longitudinal ectodermal channel called the _____.which germ layer (tissue) gives rice to our nervous system and outer coverings. a) endotherm b) ectoderm c) mesoderm d) endoderm
- Which process occurs between the zygote and the embryo stageThe _______ is an important structure for waste storage in birds and some mammals, but not in humans.A. allantoisB. yolk sacC. placentaD. umbilical cordE. amnionHumans have three openings in an analogous place. Why is there a difference in the number of openings in pigs and humans? Describe two functions of the mesentery. Why is the ductus venosus no longer needed when the pig is born?