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31 Cards in this Set

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Amebocytes
Cells in a sponge that perform digestion and transport functions
Anterior end
The end of an animal that contains its head
Bilateral Symmetry
An organism possesses bilateral symmetry if itcan only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves
Bivalve
An organism with two shells
Circulatory System
A system designed to transport food and other necessary substances throughout a creature's body
Collar Cells
Flagillated cells that punp water into a sponge
Epidermis
An outer layer of cells designed to provide protection
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
Foot
A muscular organ that is used for locomotion and takes a variety of forms depending on the animal
Ganglia
Masses of nerve cell bodies
Gemmule
A cluster of cells encased in a hard, spicule-reinforced shell
Hermaphroditic
Possessing both the male and the female reproductive organs
Invertebrates
Animals that lack a backbone
Mantle
A sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs resperation
Medusa
A free-swimming cnidarian with a bell-shaped body and tentacles
Mesenchyme
The jelly-like substance that separates the epidermis from the inner cells in a sponge
Mesoglea
The jelly-like substance that separates the epithelial cells in a cnidarian
Nematocysts
Small capsules that contain a toxin which is injected into prey or predators
Nervous System
A system of sensitive cells that respond to stimuli such as sound, touch, and taste
Ovaries
The organ that produces eggs
Polyp
A sessile, tubular cnidarian with a mouth and tentacles ar one end and a basal disk at the other
Posterior End
The end of an animal that contains the tail
Radial Symmetry
An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center
Radula
An organ covered with teeth that mollusks use to scrape food into their mouths
Regeneration
The ability to re-grow a missing part of the body
Shell
A tough, multilayered structure secreted by the mantle.It is usually used for protection, but sometimes for body support
Spherical Symmetry
An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center.
Testes
The organ that produces sperm
Univalve
An organism with a single shell
Vertebrates
Animals that possess a backbone
Visceral Hump
A hump that contains a mollusk's heart, digestive, and excretory organs