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16 Cards in this Set
- Front
- Back
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Blastulation
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specialization/ differentiation
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Gastrulation
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development of 3 germ layers (ectoderm, mesoderm, endoderm)
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Neurulation
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notochord/ neural tube development
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Ectoderm
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Gives rise to the peripheral nervous system, epidermis, and integument
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Endoderm
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Gives rise to urinary bladder/ lungs
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Diploblastic
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2 cell layers (ecto and endo)
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Triploblastic
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3 cell layers + mesoderm
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acoelomates
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no body cavity, tissues indirect contact
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pseudocoelomates
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partial cavity is pseudocoelomate, a fluid-filled space in which organs are suspended. Muscles are only on the outside
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Coelomates
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body cavity (coelom) develops within mesoderm
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Advantages of coelemates
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- fast distribution of material through body
-digestive tract becomes longer and + efficient in nutrient absorption -room to arrange organs -fexible and motility -allows specialization |
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protosome
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blastopore develop into the mouth
ex: flatworms, nematodes, mollusks, annelids, arthropods |
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deuterosome
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blastopore develops into the anus- then mouth
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Key features to Body Plans
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-symmetry
-body cavity -segmentation -external appendages |
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radial symmetry
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one main axis around which body parts are arranged (jellyfish)
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bilateral symmetry
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animals that move in 1 direction, can be divided into similar halves on only one plane
associated with cephalization |
