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31 Cards in this Set
- Front
- Back
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Invertebrates |
Animals that lack a backbone |
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Vertebrates |
Animals that posses a backbone |
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Spherical symmetry |
An organism possess spherical symmetry if it can be cut into two identical halves by any cut that runs through the organisms center. |
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Radial symmetry |
An organism possess radial symmetry if it can be cut into two identical halves by any longitudinal cut through it's center. |
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Bilateral symmetry |
An organism possess bilateral symmetry if it can only be cut into identical halves by a single longitudinal cut alonh its center which divides it into right and left halves. |
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Epidermis |
An outer layer of cells designed to provide protection. |
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Mesenchyme |
The jelly like substance that seperates the epidermis from the inner cells in a sponge. |
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Collar cells |
Flagellates cells that push water through a sponge. |
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Ameobocytes |
Cells that move using pseudopods and perform different functions in different animals. |
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Gemmule |
A cluster of cells encased in a hard spicule - reinforced shell. |
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Polyp |
The sessile tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other. |
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Medusa |
A free-swimming cnidarian with a bell-shaped body and tentacles. |
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Epithelliun |
Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance. |
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Mesoglea |
The jelly like substance that separates epithelial cells in a cnidarian. |
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Nematocytes |
Small capsules that contain a toxin which is injected into prey or predators. |
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Testes |
Organs that produce sperm. |
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Ovaries |
Organs that produce eggs. |
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Anterior end |
The end of the animal that contains it's head. |
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Posterior end |
The end of an animal that contains it's tail. |
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Circulatory system |
A system designed to transport food and other necessary substances throughout a creatures body. |
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Nervous system |
A system of sensitive cells that respond to stimuli such as sound, touch, and taste. |
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Ganglia |
Masses of nerve cell bodies. |
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Hermaphroditic |
Possessing both the male and female reproductive organs. |
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Regeneration |
The ability to regrow a missing part of the body. |
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Mantle |
A sheath of tissue that encloses the vital organs aof a mollusk, makes the mollusks she'll and performs respiration. |
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Shell |
A tough multi layered structure secreted by the mantle, generally used for protection but sometimes for body support. |
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Visceral hump |
A hump that contains a mollusks heart, digestive, and excretory organs. |
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Foot |
A muscular organ that is used for locomotion and takes a variety of forms depending on the animal. |
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Radula |
An organ covered with teeth that mollusks use to scrape food in to their mouths. |
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Univalve |
An organism with one shell. |
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Bivalve |
An organism with two shells. |
