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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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vertebrates
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animals that have a backbone
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Spherical symmetry
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can be cut into two identical half anwhere through its center
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Radial symmetry
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can be cut in half by any longitudinal cut through its center
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Bilateral
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Can be cut in half by one longitudinal cut through its center which divides the left and right
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Epidermis
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the 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 push water though a sponge
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Amoebocytes
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cells that move using pseudopods and perform different tasks 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 jelly-like substance that seperates 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 their 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 the 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
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masses of nerve cells
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Hermaphroditic
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Possessing both male and female reproductive organs
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Regeneration
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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 oprgans of a mollusk, makes the mollusk’s shell, and performs repiration
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Shell
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a tough, multi-layered structure secreted by the mantle generally used for protection, 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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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 the teeth that mollusks use to scrape food into 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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