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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 possess a backbone |
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Spherical symmetry |
An organism possesses 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 possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center |
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Bilateral symmetry |
An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudal cut along 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 separates the epidermis from the inner cells in a sponge |
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Collar cells |
Flagellated cells that push water through a sponge |
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Amoebocytes |
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, tabular 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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Epithelium |
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 the epithelial cells in a cnidarian |
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Nematocysts |
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 an animal that contains its head |
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Posterior end |
The end of an animal that contains its tail |
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Circulatory system |
A system designed to transport food and other necessary substances throughout a creature's 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 of a mollusk, makes the mollusk's shell, 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 mollusk's 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 used to scrape food into their mouths |
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Univalve |
An organism with a single shell |
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Bivalve |
An organism with two shells |
