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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Collectively, animals are known as_____because of their specialized tissue |
Metazoa |
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Parazoa |
Animals that do not have specialized tissue types or organs, but have distinct cell types |
Sponges |
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Eumetazoa |
One or more types of tissue and organs that perform specific functions |
True animals |
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Cephalization |
The localization of sensory structures at the anterior end of the body |
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Blastula |
Hollow sphere of cells after a zygote undergoes cleavage |
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Gastrulation |
When a zygote develops different layers of cells and folds the blastula inward to form a gastrula |
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How many germ layers does Radiata have? |
2, the endoderm and the ectoderm |
Diploblastic |
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How many germ layer does Bilateria have? |
3, the endoderm, the mesoderm, and the ectoderm |
Triploblastic |
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Blastopore |
Formed during gastrulation, an indentation that becomes the opening of the digestive tract |
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Protostomes |
The blastopore becomes the mouth |
Proto means first stoma means mouth |
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Deuterostomes |
The blastopore becomes the anus and the mouth is formed from a secondary opening |
Deuteros means second stoma means mouth |
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Sprial cleavage |
The planes of cell cleavage are oblique to central axis of the embryo |
Mollusks and worms, protostomes |
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Radial cleavage |
Cleavage planes are parallel or perpendicular to the vertical axis |
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Coelom |
A fluid filled body cavity or body segmentation |
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Ecdysozoa |
Animals that molt |
Nematods and arthropods |
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Ecdysis |
Process of molting, like when a crab outgrows its shell and secretes a larger one |
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Choanocytes |
Collar cells that possess flagellum |
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Spicules |
Skeletal fibers formed of protein, calcium carbonate, or silica. |
Amoebocytes and glass sponges |
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Mesoglea |
A gelatinous substance in Radiata that connects the endoderm to the ectoderm |
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Cnidocytes |
Stinging cells found in Cnidarians |
Jellyfish |
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Nematocysts |
Powerful capsuls within cnidocytes thay have an inverted coiled and barbed thread. Cnidocil are hairlike triggers found on the surface |
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Platyhelminthes |
Flat worms |
Platy means flat helminth means worm |
