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25 Cards in this Set
- Front
- Back
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Mobility |
one way that separates animals from all other kingdoms |
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Sessile |
organisms that are permanently attached to an area |
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Backbone |
protects an animals main nerve cord |
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Assymetrical |
having no particular body arrangement |
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Radial Symmetry |
all body parts radiate from central area |
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Bilateral Symmetry |
body parts arrange in two side which are usually mirror images of another |
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Dorsal |
top surface of radial symmetric organisms |
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Ventral |
bottom surface of radial symmetrical organisms |
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Anterior |
front end of bilaterally symmetric animal |
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Posterior |
Rear end of bilaterally symmetric animal |
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Medial |
the plane that divides a bilateral animal into mirror images |
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Segmentation |
repeating units or segments of an organism |
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Vertebrates |
has a backbone |
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Invertebrates |
does not have a backbone |
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Cleavage |
cell division |
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Blastula |
hollow ball of cells |
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Gastrula |
cup shaped embryo |
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Ectoderm |
outer layer forming skin, nerves, sense organs |
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Mesoderm |
middle layer forming muscle, reproductive organ, circulatory system, excretory system |
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Endoderm |
inner layer forming digestive tract, respiratory system |
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Coelomates |
organisms that have a true coelom |
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Acoelomates |
organisms without coelom |
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Coelom |
fully lined body cavity that is hollow |
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Hydrostatic Skeleton |
skeletal system where muscles surround and are supported by a water filled cavity |
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Hermaphrodite |
animal having both male and female reproductive systems |
