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30 Cards in this Set
- Front
- Back
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Invertebrates
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Animals that lack a backbone
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Vertebrates
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Animals that possesses a backbone
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Spherical symmetry
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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 longitudinal cut through its center.
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Bilateral symmetry
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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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outer layer of cells designed to provide protection
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Mesenchyme
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the jelly like substance that separates the epidermis from the inner cells in a sponge
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Collar cells
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flagellated cells that pump water into a sponge
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Amebocytes
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cells in a sponge that perform digestion and transport functions
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Polyp
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a sessile, tubular chidarian with a mouth and tentacles at one end 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 otehr surface adheres to a membrane or other substance
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Mesoglea
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jelly-like substance that separates the epitelial cells in a cnidarian
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Nematocysts
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small sapsules that contain a toxin which is injected into prey or predators
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Testes
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the organ that produces sperm
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ovaries
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organ that produces 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 the tail
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circulatory system
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a system designed to transport food and other necessary substances throughout a creatures 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
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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 re-grow 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, multi-layered structure secreted by the mantle. It is usually used for protection, but sometimes for body support
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visceral hump
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a hump that contains a mollusks heart, digestive, and excretory organs
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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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a organ covered with teeth that mollusks use to scrape foodinto their mouths
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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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