Flashcard Set Preview
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| 1 |
What is the normal number of chromosomes in a human?
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46
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| 2 |
What is the difference between the blastula and blastocyst?
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Blastula is a solid cell ball while the blastocyst is hollow
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| 3 |
What are the three primary germ layers?
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Ectoderm, Mesoderm, and Endoderm
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| 4 |
What color is amniotic fluid?
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Clear
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| 5 |
What color is yolk?
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yellow
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| 6 |
What is the trophoblast and what does it become later in develpoment?
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the outer layer of a blastocyst, becomes the placenta to nourish the develping embyro
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| 7 |
What is the inner cell mass and what does it become later in development?
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A layered group of cells between the amniotic fluid and the yolk. It becomes the actual embryo.
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| 8 |
What structures derive from the ectoderm?
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Epithelium and nervous tissue of the CNS
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| 9 |
What germ layer does epithelium and nervous tissue derive from?
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The ectoderm
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| 10 |
What structures derive from the mesoderm?
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Muscle, bone, and all cardiovascular tissue (the heart and blood vessels)
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| 11 |
What germ layer does muscle, bone, and the cardiovascular system derive from?
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The mesoderm
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| 12 |
What structures derive from the Endoderm?
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All of the viscera (guts)
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| 13 |
What germ layer does all viscera derive from?
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The endoderm
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| 14 |
What is significant about the "nematode level" of complexity and onward?
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At this level, the ceolom develops from the space between mosederm layers.
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| 15 |
What is the primitive streak?
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A canyon that forms within the ectodermal cells, the sides of eventually fuse to form a tube...
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| 16 |
What are the 4 defining chordate feature?
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1) Dorsal hollow nerve cord (forms brain and spine)2) Notochord (protect nerve cord)3) Tail...
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