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31 Cards in this Set
- Front
- Back
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Invertebrates
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Animals that lack a backbone
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Vertebrate
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Animals that possess a backbone
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Spherical Symmetry
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An organism possesses pherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center
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Radial Symmetry
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An organism possesses radial symmetry if it can be cut into two identical halves by any longitudal cut through its center
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Bilateral symmetry
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An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves.
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Epidermis
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An outer layer of cells designed to provide protection
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Mesenchyme
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The jellylike substance that separates the epidermis from the innter cells in a sponge
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Collar Cells
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Flagellated cells that push water through a sponge
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Amoebocytes
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Cells that move using pseudopods and perform different functions in different animals
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Gemmule
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A cluster of cells encased in a hard, spicule-reinforced shell
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Polyp
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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
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A free-swimming cnidarian with a bell-shaped body and tentacles
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Epithelium
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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
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The jellylike substance that separates the epithelial cells in a cnidarian
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Nematocysts
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Small capsules that contain a toxin which is injected into prey or predators
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Testes
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Organs that produce sperm
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Ovaries
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Organs that produce eggs
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Anterior end
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The end of an animal that contains its head
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Posterior end
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The end of an animal that contains its tail
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Circulatory system
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A system designed to transport food and other necessary substances throughout a creature's body
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Nervous system
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A system of sensitive cells that respond to stimuli such as sound, touch, and taste
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Ganglia (singular: ganglion)
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Masses of nerve cell bodies
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Hermaphroditic
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Possessing both the male and the female reproductive organs
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Regeneration
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The ability to regrow a missing part of the body
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Mantle
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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
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A tough, multilayered structure secreted by the mantle, generally used for protection, but sometimes for body support
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Visceral hump
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A hump that contains a mollusk's heart, digestive, and excretory organs
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Univalve
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An organism with a single shell
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Bivalve
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An organism with two shells
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Foot
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A muscular organ that is used for locomotion and takes a variety of forms depending on the animal
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Radula
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An organ covered with teeth that mollusks use to scrape food into their mouths
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